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Diffstat (limited to 'node_modules/babel-template/node_modules/lodash/memoize.js')
-rw-r--r-- | node_modules/babel-template/node_modules/lodash/memoize.js | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/node_modules/babel-template/node_modules/lodash/memoize.js b/node_modules/babel-template/node_modules/lodash/memoize.js new file mode 100644 index 000000000..8351cb392 --- /dev/null +++ b/node_modules/babel-template/node_modules/lodash/memoize.js @@ -0,0 +1,73 @@ +var MapCache = require('./_MapCache'); + +/** Error message constants. */ +var FUNC_ERROR_TEXT = 'Expected a function'; + +/** + * Creates a function that memoizes the result of `func`. If `resolver` is + * provided, it determines the cache key for storing the result based on the + * arguments provided to the memoized function. By default, the first argument + * provided to the memoized function is used as the map cache key. The `func` + * is invoked with the `this` binding of the memoized function. + * + * **Note:** The cache is exposed as the `cache` property on the memoized + * function. Its creation may be customized by replacing the `_.memoize.Cache` + * constructor with one whose instances implement the + * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object) + * method interface of `delete`, `get`, `has`, and `set`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to have its output memoized. + * @param {Function} [resolver] The function to resolve the cache key. + * @returns {Function} Returns the new memoized function. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * var other = { 'c': 3, 'd': 4 }; + * + * var values = _.memoize(_.values); + * values(object); + * // => [1, 2] + * + * values(other); + * // => [3, 4] + * + * object.a = 2; + * values(object); + * // => [1, 2] + * + * // Modify the result cache. + * values.cache.set(object, ['a', 'b']); + * values(object); + * // => ['a', 'b'] + * + * // Replace `_.memoize.Cache`. + * _.memoize.Cache = WeakMap; + */ +function memoize(func, resolver) { + if (typeof func != 'function' || (resolver && typeof resolver != 'function')) { + throw new TypeError(FUNC_ERROR_TEXT); + } + var memoized = function() { + var args = arguments, + key = resolver ? resolver.apply(this, args) : args[0], + cache = memoized.cache; + + if (cache.has(key)) { + return cache.get(key); + } + var result = func.apply(this, args); + memoized.cache = cache.set(key, result) || cache; + return result; + }; + memoized.cache = new (memoize.Cache || MapCache); + return memoized; +} + +// Expose `MapCache`. +memoize.Cache = MapCache; + +module.exports = memoize; |