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85 lines
2.6 KiB
JavaScript
85 lines
2.6 KiB
JavaScript
/**
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* lodash 4.0.1 (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var createWrapper = require('lodash._createwrapper'),
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rest = require('lodash.rest');
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/** Used to compose bitmasks for wrapper metadata. */
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var PARTIAL_FLAG = 32;
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/** Used as the internal argument placeholder. */
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var PLACEHOLDER = '__lodash_placeholder__';
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/**
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* Replaces all `placeholder` elements in `array` with an internal placeholder
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* and returns an array of their indexes.
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*
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* @private
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* @param {Array} array The array to modify.
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* @param {*} placeholder The placeholder to replace.
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* @returns {Array} Returns the new array of placeholder indexes.
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*/
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function replaceHolders(array, placeholder) {
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var index = -1,
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length = array.length,
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resIndex = -1,
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result = [];
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while (++index < length) {
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if (array[index] === placeholder) {
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array[index] = PLACEHOLDER;
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result[++resIndex] = index;
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}
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}
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return result;
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}
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/**
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* Creates a function that invokes `func` with `partial` arguments prepended
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* to those provided to the new function. This method is like `_.bind` except
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* it does **not** alter the `this` binding.
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*
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* The `_.partial.placeholder` value, which defaults to `_` in monolithic
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* builds, may be used as a placeholder for partially applied arguments.
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*
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* **Note:** This method doesn't set the "length" property of partially
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* applied functions.
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*
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* @static
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* @memberOf _
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* @category Function
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* @param {Function} func The function to partially apply arguments to.
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* @param {...*} [partials] The arguments to be partially applied.
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* @returns {Function} Returns the new partially applied function.
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* @example
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*
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* var greet = function(greeting, name) {
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* return greeting + ' ' + name;
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* };
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*
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* var sayHelloTo = _.partial(greet, 'hello');
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* sayHelloTo('fred');
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* // => 'hello fred'
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*
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* // Partially applied with placeholders.
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* var greetFred = _.partial(greet, _, 'fred');
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* greetFred('hi');
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* // => 'hi fred'
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*/
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var partial = rest(function(func, partials) {
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var placeholder = partial.placeholder,
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holders = replaceHolders(partials, placeholder);
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return createWrapper(func, PARTIAL_FLAG, undefined, partials, holders);
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});
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// Assign default placeholders.
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partial.placeholder = {};
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module.exports = partial;
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