basant307/AI_Governance_Project

1import MapCache from './_MapCache.js';2 3/** Error message constants. */4var FUNC_ERROR_TEXT = 'Expected a function';5 6/**7 * Creates a function that memoizes the result of `func`. If `resolver` is8 * provided, it determines the cache key for storing the result based on the9 * arguments provided to the memoized function. By default, the first argument10 * provided to the memoized function is used as the map cache key. The `func`11 * is invoked with the `this` binding of the memoized function.12 *13 * **Note:** The cache is exposed as the `cache` property on the memoized14 * function. Its creation may be customized by replacing the `_.memoize.Cache`15 * constructor with one whose instances implement the16 * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)17 * method interface of `clear`, `delete`, `get`, `has`, and `set`.18 *19 * @static20 * @memberOf _21 * @since 0.1.022 * @category Function23 * @param {Function} func The function to have its output memoized.24 * @param {Function} [resolver] The function to resolve the cache key.25 * @returns {Function} Returns the new memoized function.26 * @example27 *28 * var object = { 'a': 1, 'b': 2 };29 * var other = { 'c': 3, 'd': 4 };30 *31 * var values = _.memoize(_.values);32 * values(object);33 * // => [1, 2]34 *35 * values(other);36 * // => [3, 4]37 *38 * object.a = 2;39 * values(object);40 * // => [1, 2]41 *42 * // Modify the result cache.43 * values.cache.set(object, ['a', 'b']);44 * values(object);45 * // => ['a', 'b']46 *47 * // Replace `_.memoize.Cache`.48 * _.memoize.Cache = WeakMap;49 */50function memoize(func, resolver) {51  if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {52    throw new TypeError(FUNC_ERROR_TEXT);53  }54  var memoized = function() {55    var args = arguments,56        key = resolver ? resolver.apply(this, args) : args[0],57        cache = memoized.cache;58 59    if (cache.has(key)) {60      return cache.get(key);61    }62    var result = func.apply(this, args);63    memoized.cache = cache.set(key, result) || cache;64    return result;65  };66  memoized.cache = new (memoize.Cache || MapCache);67  return memoized;68}69 70// Expose `MapCache`.71memoize.Cache = MapCache;72 73export default memoize;74