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57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
9 years ago
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var createWrapper = require('../internal/createWrapper'),
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replaceHolders = require('../internal/replaceHolders'),
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restParam = require('./restParam');
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/** Used to compose bitmasks for wrapper metadata. */
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var BIND_FLAG = 1,
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PARTIAL_FLAG = 32;
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/**
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* Creates a function that invokes `func` with the `this` binding of `thisArg`
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* and prepends any additional `_.bind` arguments to those provided to the
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* bound function.
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*
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* The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
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* may be used as a placeholder for partially applied arguments.
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*
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* **Note:** Unlike native `Function#bind` this method does not set the "length"
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* property of bound 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 bind.
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* @param {*} thisArg The `this` binding of `func`.
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* @param {...*} [partials] The arguments to be partially applied.
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* @returns {Function} Returns the new bound function.
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* @example
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*
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* var greet = function(greeting, punctuation) {
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* return greeting + ' ' + this.user + punctuation;
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* };
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*
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* var object = { 'user': 'fred' };
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*
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* var bound = _.bind(greet, object, 'hi');
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* bound('!');
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* // => 'hi fred!'
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*
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* // using placeholders
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* var bound = _.bind(greet, object, _, '!');
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* bound('hi');
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* // => 'hi fred!'
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*/
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var bind = restParam(function(func, thisArg, partials) {
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var bitmask = BIND_FLAG;
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if (partials.length) {
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var holders = replaceHolders(partials, bind.placeholder);
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bitmask |= PARTIAL_FLAG;
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}
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return createWrapper(func, bitmask, thisArg, partials, holders);
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});
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// Assign default placeholders.
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bind.placeholder = {};
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module.exports = bind;
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