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Diffstat (limited to 'node_modules/async/memoize.js')
| -rw-r--r-- | node_modules/async/memoize.js | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/node_modules/async/memoize.js b/node_modules/async/memoize.js deleted file mode 100644 index 4c757ab8d..000000000 --- a/node_modules/async/memoize.js +++ /dev/null @@ -1,95 +0,0 @@ -'use strict'; - -Object.defineProperty(exports, "__esModule", { - value: true -}); -exports.default = memoize; - -var _identity = require('lodash/identity'); - -var _identity2 = _interopRequireDefault(_identity); - -var _baseRest = require('lodash/_baseRest'); - -var _baseRest2 = _interopRequireDefault(_baseRest); - -var _setImmediate = require('./internal/setImmediate'); - -var _setImmediate2 = _interopRequireDefault(_setImmediate); - -var _initialParams = require('./internal/initialParams'); - -var _initialParams2 = _interopRequireDefault(_initialParams); - -function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } - -function has(obj, key) { - return key in obj; -} - -/** - * Caches the results of an `async` function. When creating a hash to store - * function results against, the callback is omitted from the hash and an - * optional hash function can be used. - * - * If no hash function is specified, the first argument is used as a hash key, - * which may work reasonably if it is a string or a data type that converts to a - * distinct string. Note that objects and arrays will not behave reasonably. - * Neither will cases where the other arguments are significant. In such cases, - * specify your own hash function. - * - * The cache of results is exposed as the `memo` property of the function - * returned by `memoize`. - * - * @name memoize - * @static - * @memberOf module:Utils - * @method - * @category Util - * @param {Function} fn - The function to proxy and cache results from. - * @param {Function} hasher - An optional function for generating a custom hash - * for storing results. It has all the arguments applied to it apart from the - * callback, and must be synchronous. - * @returns {Function} a memoized version of `fn` - * @example - * - * var slow_fn = function(name, callback) { - * // do something - * callback(null, result); - * }; - * var fn = async.memoize(slow_fn); - * - * // fn can now be used as if it were slow_fn - * fn('some name', function() { - * // callback - * }); - */ -function memoize(fn, hasher) { - var memo = Object.create(null); - var queues = Object.create(null); - hasher = hasher || _identity2.default; - var memoized = (0, _initialParams2.default)(function memoized(args, callback) { - var key = hasher.apply(null, args); - if (has(memo, key)) { - (0, _setImmediate2.default)(function () { - callback.apply(null, memo[key]); - }); - } else if (has(queues, key)) { - queues[key].push(callback); - } else { - queues[key] = [callback]; - fn.apply(null, args.concat([(0, _baseRest2.default)(function (args) { - memo[key] = args; - var q = queues[key]; - delete queues[key]; - for (var i = 0, l = q.length; i < l; i++) { - q[i].apply(null, args); - } - })])); - } - }); - memoized.memo = memo; - memoized.unmemoized = fn; - return memoized; -} -module.exports = exports['default'];
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