668 lines
18 KiB
JavaScript
668 lines
18 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.clone = clone;
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exports.addLast = addLast;
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exports.addFirst = addFirst;
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exports.removeLast = removeLast;
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exports.removeFirst = removeFirst;
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exports.insert = insert;
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exports.removeAt = removeAt;
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exports.replaceAt = replaceAt;
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exports.getIn = getIn;
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exports.set = set;
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exports.setIn = setIn;
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exports.update = update;
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exports.updateIn = updateIn;
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exports.merge = merge;
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exports.mergeDeep = mergeDeep;
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exports.mergeIn = mergeIn;
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exports.omit = omit;
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exports.addDefaults = addDefaults;
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exports.default = void 0;
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/* eslint-disable @typescript-eslint/ban-types */
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/*!
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* Timm
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*
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* Immutability helpers with fast reads and acceptable writes.
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*
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* @copyright Guillermo Grau Panea 2016
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* @license MIT
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*/
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const INVALID_ARGS = 'INVALID_ARGS';
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const IS_DEV = process.env.NODE_ENV !== 'production';
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// ===============================================
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// ### Helpers
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// ===============================================
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function throwStr(msg) {
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throw new Error(msg);
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}
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function getKeysAndSymbols(obj) {
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const keys = Object.keys(obj);
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if (Object.getOwnPropertySymbols) {
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// @ts-ignore
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return keys.concat(Object.getOwnPropertySymbols(obj));
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}
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return keys;
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}
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const hasOwnProperty = {}.hasOwnProperty;
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function clone(obj0) {
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// As array
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if (Array.isArray(obj0)) return obj0.slice(); // As object
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const obj = obj0;
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const keys = getKeysAndSymbols(obj);
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const out = {};
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for (let i = 0; i < keys.length; i++) {
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const key = keys[i];
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out[key] = obj[key];
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} // @ts-ignore (see type tests)
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return out;
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} // Custom guard
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function isObject(o) {
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return o != null && typeof o === 'object';
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} // _deepFreeze = (obj) ->
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// Object.freeze obj
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// for key in Object.getOwnPropertyNames obj
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// val = obj[key]
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// if isObject(val) and not Object.isFrozen val
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// _deepFreeze val
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// obj
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// ===============================================
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// -- ### Arrays
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// ===============================================
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// -- #### addLast()
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// -- Returns a new array with an appended item or items.
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// --
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// -- Usage: `addLast(array, val)`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = addLast(arr, 'c')
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// -- // ['a', 'b', 'c']
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// -- arr2 === arr
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// -- // false
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// -- arr3 = addLast(arr, ['c', 'd'])
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// -- // ['a', 'b', 'c', 'd']
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// -- ```
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// `array.concat(val)` also handles the scalar case,
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// but is apparently very slow
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function addLast(array, val) {
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if (Array.isArray(val)) return array.concat(val);
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return array.concat([val]);
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} // -- #### addFirst()
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// -- Returns a new array with a prepended item or items.
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// --
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// -- Usage: `addFirst(array, val)`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = addFirst(arr, 'c')
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// -- // ['c', 'a', 'b']
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// -- arr2 === arr
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// -- // false
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// -- arr3 = addFirst(arr, ['c', 'd'])
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// -- // ['c', 'd', 'a', 'b']
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// -- ```
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function addFirst(array, val) {
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if (Array.isArray(val)) return val.concat(array);
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return [val].concat(array);
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} // -- #### removeLast()
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// -- Returns a new array removing the last item.
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// --
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// -- Usage: `removeLast(array)`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = removeLast(arr)
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// -- // ['a']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same array is returned if there are no changes:
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// -- arr3 = []
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// -- removeLast(arr3) === arr3
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// -- // true
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// -- ```
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function removeLast(array) {
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if (!array.length) return array;
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return array.slice(0, array.length - 1);
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} // -- #### removeFirst()
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// -- Returns a new array removing the first item.
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// --
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// -- Usage: `removeFirst(array)`
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// --
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// -- ```js
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// -- arr = ['a', 'b']
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// -- arr2 = removeFirst(arr)
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// -- // ['b']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same array is returned if there are no changes:
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// -- arr3 = []
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// -- removeFirst(arr3) === arr3
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// -- // true
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// -- ```
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function removeFirst(array) {
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if (!array.length) return array;
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return array.slice(1);
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} // -- #### insert()
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// -- Returns a new array obtained by inserting an item or items
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// -- at a specified index.
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// --
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// -- Usage: `insert(array, idx, val)`
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// --
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// -- ```js
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// -- arr = ['a', 'b', 'c']
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// -- arr2 = insert(arr, 1, 'd')
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// -- // ['a', 'd', 'b', 'c']
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// -- arr2 === arr
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// -- // false
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// -- insert(arr, 1, ['d', 'e'])
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// -- // ['a', 'd', 'e', 'b', 'c']
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// -- ```
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function insert(array, idx, val) {
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return array.slice(0, idx).concat(Array.isArray(val) ? val : [val]).concat(array.slice(idx));
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} // -- #### removeAt()
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// -- Returns a new array obtained by removing an item at
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// -- a specified index.
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// --
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// -- Usage: `removeAt(array, idx)`
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// --
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// -- ```js
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// -- arr = ['a', 'b', 'c']
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// -- arr2 = removeAt(arr, 1)
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// -- // ['a', 'c']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same array is returned if there are no changes:
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// -- removeAt(arr, 4) === arr
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// -- // true
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// -- ```
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function removeAt(array, idx) {
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if (idx >= array.length || idx < 0) return array;
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return array.slice(0, idx).concat(array.slice(idx + 1));
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} // -- #### replaceAt()
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// -- Returns a new array obtained by replacing an item at
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// -- a specified index. If the provided item is the same as
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// -- (*referentially equal to*) the previous item at that position,
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// -- the original array is returned.
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// --
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// -- Usage: `replaceAt(array, idx, newItem)`
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// --
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// -- ```js
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// -- arr = ['a', 'b', 'c']
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// -- arr2 = replaceAt(arr, 1, 'd')
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// -- // ['a', 'd', 'c']
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// -- arr2 === arr
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- replaceAt(arr, 1, 'b') === arr
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// -- // true
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// -- ```
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function replaceAt(array, idx, newItem) {
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if (array[idx] === newItem) return array;
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const len = array.length;
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const result = Array(len);
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for (let i = 0; i < len; i++) {
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result[i] = array[i];
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}
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result[idx] = newItem;
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return result;
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} // ===============================================
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// -- ### Collections (objects and arrays)
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// ===============================================
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// -- #### getIn()
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// -- Returns a value from an object at a given path. Works with
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// -- nested arrays and objects. If the path does not exist, it returns
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// -- `undefined`.
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// --
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// -- Usage: `getIn(obj, path)`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, d: { d1: 3, d2: 4 }, e: ['a', 'b', 'c'] }
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// -- getIn(obj, ['d', 'd1'])
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// -- // 3
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// -- getIn(obj, ['e', 1])
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// -- // 'b'
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// -- ```
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function getIn(obj, path) {
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if (!Array.isArray(path)) {
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throwStr(IS_DEV ? 'A path array should be provided when calling getIn()' : INVALID_ARGS);
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}
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if (obj == null) return undefined;
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let ptr = obj;
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for (let i = 0; i < path.length; i++) {
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const key = path[i];
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ptr = ptr != null ? ptr[key] : undefined;
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if (ptr === undefined) return ptr;
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}
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return ptr;
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} // -- #### set()
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// -- Returns a new object with a modified attribute.
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// -- If the provided value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// --
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// -- Usage: `set(obj, key, val)`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, c: 3 }
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// -- obj2 = set(obj, 'b', 5)
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// -- // { a: 1, b: 5, c: 3 }
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// -- obj2 === obj
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- set(obj, 'b', 2) === obj
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// -- // true
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// -- ```
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// When called with an undefined/null `obj`, `set()` returns either
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// a single-element array, or a single-key object
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// Implementation
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function set(obj0, key, val) {
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let obj = obj0;
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if (obj == null) obj = typeof key === 'number' ? [] : {};
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if (obj[key] === val) return obj;
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const obj2 = clone(obj);
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obj2[key] = val;
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return obj2;
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} // -- #### setIn()
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// -- Returns a new object with a modified **nested** attribute.
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// --
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// -- Notes:
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// --
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// -- * If the provided value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// -- * If the path does not exist, it will be created before setting
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// -- the new value.
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// --
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// -- Usage: `setIn(obj, path, val)`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, d: { d1: 3, d2: 4 }, e: { e1: 'foo', e2: 'bar' } }
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// -- obj2 = setIn(obj, ['d', 'd1'], 4)
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// -- // { a: 1, b: 2, d: { d1: 4, d2: 4 }, e: { e1: 'foo', e2: 'bar' } }
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// -- obj2 === obj
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// -- // false
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// -- obj2.d === obj.d
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// -- // false
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// -- obj2.e === obj.e
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// -- // true
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// --
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// -- // The same object is returned if there are no changes:
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// -- obj3 = setIn(obj, ['d', 'd1'], 3)
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// -- // { a: 1, b: 2, d: { d1: 3, d2: 4 }, e: { e1: 'foo', e2: 'bar' } }
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// -- obj3 === obj
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// -- // true
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// -- obj3.d === obj.d
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// -- // true
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// -- obj3.e === obj.e
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// -- // true
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// --
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// -- // ... unknown paths create intermediate keys. Numeric segments are treated as array indices:
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// -- setIn({ a: 3 }, ['unknown', 0, 'path'], 4)
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// -- // { a: 3, unknown: [{ path: 4 }] }
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// -- ```
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function setIn(obj, path, val) {
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if (!path.length) return val;
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return doSetIn(obj, path, val, 0);
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}
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function doSetIn(obj, path, val, idx) {
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let newValue;
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const key = path[idx];
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if (idx === path.length - 1) {
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newValue = val;
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} else {
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const nestedObj = isObject(obj) && isObject(obj[key]) ? obj[key] : typeof path[idx + 1] === 'number' ? [] : {};
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newValue = doSetIn(nestedObj, path, val, idx + 1);
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}
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return set(obj, key, newValue);
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} // -- #### update()
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// -- Returns a new object with a modified attribute,
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// -- calculated via a user-provided callback based on the current value.
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// -- If the calculated value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// --
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// -- Usage: `update(obj, key, fnUpdate)`
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// --
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// -- ```js
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// -- obj = { a: 1, b: 2, c: 3 }
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// -- obj2 = update(obj, 'b', (val) => val + 1)
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// -- // { a: 1, b: 3, c: 3 }
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// -- obj2 === obj
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- update(obj, 'b', (val) => val) === obj
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// -- // true
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// -- ```
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function update(obj, key, fnUpdate) {
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const prevVal = obj == null ? undefined : obj[key];
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const nextVal = fnUpdate(prevVal);
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return set(obj, key, nextVal);
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} // -- #### updateIn()
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// -- Returns a new object with a modified **nested** attribute,
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// -- calculated via a user-provided callback based on the current value.
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// -- If the calculated value is the same as (*referentially equal to*)
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// -- the previous value, the original object is returned.
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// --
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// -- Usage: `updateIn<T: ArrayOrObject>(obj: T, path: Array<Key>,
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// -- fnUpdate: (prevValue: any) => any): T`
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// --
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// -- ```js
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// -- obj = { a: 1, d: { d1: 3, d2: 4 } }
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// -- obj2 = updateIn(obj, ['d', 'd1'], (val) => val + 1)
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// -- // { a: 1, d: { d1: 4, d2: 4 } }
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// -- obj2 === obj
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// -- // false
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// --
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// -- // The same object is returned if there are no changes:
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// -- obj3 = updateIn(obj, ['d', 'd1'], (val) => val)
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// -- // { a: 1, d: { d1: 3, d2: 4 } }
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// -- obj3 === obj
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// -- // true
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// -- ```
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function updateIn(obj, path, fnUpdate) {
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const prevVal = getIn(obj, path);
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const nextVal = fnUpdate(prevVal);
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return setIn(obj, path, nextVal);
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} // -- #### merge()
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// -- Returns a new object built as follows: the overlapping keys from the
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// -- second one overwrite the corresponding entries from the first one.
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// -- Similar to `Object.assign()`, but immutable.
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// --
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// -- Usage:
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// --
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// -- * `merge(obj1, obj2)`
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// -- * `merge(obj1, ...objects)`
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// --
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// -- The unmodified `obj1` is returned if `obj2` does not *provide something
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// -- new to* `obj1`, i.e. if either of the following
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// -- conditions are true:
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|
// --
|
||
|
// -- * `obj2` is `null` or `undefined`
|
||
|
// -- * `obj2` is an object, but it is empty
|
||
|
// -- * All attributes of `obj2` are `undefined`
|
||
|
// -- * All attributes of `obj2` are referentially equal to the
|
||
|
// -- corresponding attributes of `obj1`
|
||
|
// --
|
||
|
// -- Note that `undefined` attributes in `obj2` do not modify the
|
||
|
// -- corresponding attributes in `obj1`.
|
||
|
// --
|
||
|
// -- ```js
|
||
|
// -- obj1 = { a: 1, b: 2, c: 3 }
|
||
|
// -- obj2 = { c: 4, d: 5 }
|
||
|
// -- obj3 = merge(obj1, obj2)
|
||
|
// -- // { a: 1, b: 2, c: 4, d: 5 }
|
||
|
// -- obj3 === obj1
|
||
|
// -- // false
|
||
|
// --
|
||
|
// -- // The same object is returned if there are no changes:
|
||
|
// -- merge(obj1, { c: 3 }) === obj1
|
||
|
// -- // true
|
||
|
// -- ```
|
||
|
// Signatures:
|
||
|
// - 1 arg
|
||
|
|
||
|
|
||
|
// Implementation
|
||
|
function merge(a, b, c, d, e, f, ...rest) {
|
||
|
return rest.length ? doMerge.call(null, false, false, a, b, c, d, e, f, ...rest) : doMerge(false, false, a, b, c, d, e, f);
|
||
|
} // -- #### mergeDeep()
|
||
|
// -- Returns a new object built as follows: the overlapping keys from the
|
||
|
// -- second one overwrite the corresponding entries from the first one.
|
||
|
// -- If both the first and second entries are objects they are merged recursively.
|
||
|
// -- Similar to `Object.assign()`, but immutable, and deeply merging.
|
||
|
// --
|
||
|
// -- Usage:
|
||
|
// --
|
||
|
// -- * `mergeDeep(obj1, obj2)`
|
||
|
// -- * `mergeDeep(obj1, ...objects)`
|
||
|
// --
|
||
|
// -- The unmodified `obj1` is returned if `obj2` does not *provide something
|
||
|
// -- new to* `obj1`, i.e. if either of the following
|
||
|
// -- conditions are true:
|
||
|
// --
|
||
|
// -- * `obj2` is `null` or `undefined`
|
||
|
// -- * `obj2` is an object, but it is empty
|
||
|
// -- * All attributes of `obj2` are `undefined`
|
||
|
// -- * All attributes of `obj2` are referentially equal to the
|
||
|
// -- corresponding attributes of `obj1`
|
||
|
// --
|
||
|
// -- Note that `undefined` attributes in `obj2` do not modify the
|
||
|
// -- corresponding attributes in `obj1`.
|
||
|
// --
|
||
|
// -- ```js
|
||
|
// -- obj1 = { a: 1, b: 2, c: { a: 1 } }
|
||
|
// -- obj2 = { b: 3, c: { b: 2 } }
|
||
|
// -- obj3 = mergeDeep(obj1, obj2)
|
||
|
// -- // { a: 1, b: 3, c: { a: 1, b: 2 } }
|
||
|
// -- obj3 === obj1
|
||
|
// -- // false
|
||
|
// --
|
||
|
// -- // The same object is returned if there are no changes:
|
||
|
// -- mergeDeep(obj1, { c: { a: 1 } }) === obj1
|
||
|
// -- // true
|
||
|
// -- ```
|
||
|
|
||
|
|
||
|
function mergeDeep(a, b, c, d, e, f, ...rest) {
|
||
|
return rest.length ? doMerge.call(null, false, true, a, b, c, d, e, f, ...rest) : doMerge(false, true, a, b, c, d, e, f);
|
||
|
} // -- #### mergeIn()
|
||
|
// -- Similar to `merge()`, but merging the value at a given nested path.
|
||
|
// --
|
||
|
// -- Usage examples:
|
||
|
// --
|
||
|
// -- * `mergeIn(obj1, path, obj2)`
|
||
|
// -- * `mergeIn(obj1, path, ...objects)`
|
||
|
// --
|
||
|
// -- ```js
|
||
|
// -- obj1 = { a: 1, d: { b: { d1: 3, d2: 4 } } }
|
||
|
// -- obj2 = { d3: 5 }
|
||
|
// -- obj3 = mergeIn(obj1, ['d', 'b'], obj2)
|
||
|
// -- // { a: 1, d: { b: { d1: 3, d2: 4, d3: 5 } } }
|
||
|
// -- obj3 === obj1
|
||
|
// -- // false
|
||
|
// --
|
||
|
// -- // The same object is returned if there are no changes:
|
||
|
// -- mergeIn(obj1, ['d', 'b'], { d2: 4 }) === obj1
|
||
|
// -- // true
|
||
|
// -- ```
|
||
|
|
||
|
|
||
|
function mergeIn(a, path, b, c, d, e, f, ...rest) {
|
||
|
let prevVal = getIn(a, path);
|
||
|
if (prevVal == null) prevVal = {};
|
||
|
let nextVal;
|
||
|
|
||
|
if (rest.length) {
|
||
|
nextVal = doMerge.call(null, false, false, prevVal, b, c, d, e, f, ...rest);
|
||
|
} else {
|
||
|
nextVal = doMerge(false, false, prevVal, b, c, d, e, f);
|
||
|
}
|
||
|
|
||
|
return setIn(a, path, nextVal);
|
||
|
} // -- #### omit()
|
||
|
// -- Returns an object excluding one or several attributes.
|
||
|
// --
|
||
|
// -- Usage: `omit(obj, attrs)`
|
||
|
//
|
||
|
// -- ```js
|
||
|
// -- obj = { a: 1, b: 2, c: 3, d: 4 }
|
||
|
// -- omit(obj, 'a')
|
||
|
// -- // { b: 2, c: 3, d: 4 }
|
||
|
// -- omit(obj, ['b', 'c'])
|
||
|
// -- // { a: 1, d: 4 }
|
||
|
// --
|
||
|
// -- // The same object is returned if there are no changes:
|
||
|
// -- omit(obj, 'z') === obj1
|
||
|
// -- // true
|
||
|
// -- ```
|
||
|
|
||
|
|
||
|
function omit(obj, attrs) {
|
||
|
const omitList = Array.isArray(attrs) ? attrs : [attrs];
|
||
|
let fDoSomething = false;
|
||
|
|
||
|
for (let i = 0; i < omitList.length; i++) {
|
||
|
if (hasOwnProperty.call(obj, omitList[i])) {
|
||
|
fDoSomething = true;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (!fDoSomething) return obj;
|
||
|
const out = {};
|
||
|
const keys = getKeysAndSymbols(obj);
|
||
|
|
||
|
for (let i = 0; i < keys.length; i++) {
|
||
|
const key = keys[i];
|
||
|
if (omitList.indexOf(key) >= 0) continue;
|
||
|
out[key] = obj[key];
|
||
|
}
|
||
|
|
||
|
return out;
|
||
|
} // -- #### addDefaults()
|
||
|
// -- Returns a new object built as follows: `undefined` keys in the first one
|
||
|
// -- are filled in with the corresponding values from the second one
|
||
|
// -- (even if they are `null`).
|
||
|
// --
|
||
|
// -- Usage:
|
||
|
// --
|
||
|
// -- * `addDefaults(obj, defaults)`
|
||
|
// -- * `addDefaults(obj, ...defaultObjects)`
|
||
|
// --
|
||
|
// -- ```js
|
||
|
// -- obj1 = { a: 1, b: 2, c: 3 }
|
||
|
// -- obj2 = { c: 4, d: 5, e: null }
|
||
|
// -- obj3 = addDefaults(obj1, obj2)
|
||
|
// -- // { a: 1, b: 2, c: 3, d: 5, e: null }
|
||
|
// -- obj3 === obj1
|
||
|
// -- // false
|
||
|
// --
|
||
|
// -- // The same object is returned if there are no changes:
|
||
|
// -- addDefaults(obj1, { c: 4 }) === obj1
|
||
|
// -- // true
|
||
|
// -- ```
|
||
|
// Signatures:
|
||
|
// - 2 args
|
||
|
|
||
|
|
||
|
// Implementation and catch-all
|
||
|
function addDefaults(a, b, c, d, e, f, ...rest) {
|
||
|
return rest.length ? doMerge.call(null, true, false, a, b, c, d, e, f, ...rest) : doMerge(true, false, a, b, c, d, e, f);
|
||
|
}
|
||
|
|
||
|
function doMerge(fAddDefaults, fDeep, first, ...rest) {
|
||
|
let out = first;
|
||
|
|
||
|
if (!(out != null)) {
|
||
|
throwStr(IS_DEV ? 'At least one object should be provided to merge()' : INVALID_ARGS);
|
||
|
}
|
||
|
|
||
|
let fChanged = false;
|
||
|
|
||
|
for (let idx = 0; idx < rest.length; idx++) {
|
||
|
const obj = rest[idx];
|
||
|
if (obj == null) continue;
|
||
|
const keys = getKeysAndSymbols(obj);
|
||
|
if (!keys.length) continue;
|
||
|
|
||
|
for (let j = 0; j <= keys.length; j++) {
|
||
|
const key = keys[j];
|
||
|
if (fAddDefaults && out[key] !== undefined) continue;
|
||
|
let nextVal = obj[key];
|
||
|
|
||
|
if (fDeep && isObject(out[key]) && isObject(nextVal)) {
|
||
|
nextVal = doMerge(fAddDefaults, fDeep, out[key], nextVal);
|
||
|
}
|
||
|
|
||
|
if (nextVal === undefined || nextVal === out[key]) continue;
|
||
|
|
||
|
if (!fChanged) {
|
||
|
fChanged = true;
|
||
|
out = clone(out);
|
||
|
}
|
||
|
|
||
|
out[key] = nextVal;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return out;
|
||
|
} // ===============================================
|
||
|
// ### Public API
|
||
|
// ===============================================
|
||
|
|
||
|
|
||
|
const timm = {
|
||
|
clone,
|
||
|
addLast,
|
||
|
addFirst,
|
||
|
removeLast,
|
||
|
removeFirst,
|
||
|
insert,
|
||
|
removeAt,
|
||
|
replaceAt,
|
||
|
getIn,
|
||
|
set,
|
||
|
setIn,
|
||
|
update,
|
||
|
updateIn,
|
||
|
merge,
|
||
|
mergeDeep,
|
||
|
mergeIn,
|
||
|
omit,
|
||
|
addDefaults
|
||
|
};
|
||
|
var _default = timm;
|
||
|
exports.default = _default;
|