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var baseRest = require('./_baseRest'), | |
createWrap = require('./_createWrap'), | |
getHolder = require('./_getHolder'), | |
replaceHolders = require('./_replaceHolders'); | |
/** Used to compose bitmasks for function metadata. */ | |
var WRAP_BIND_FLAG = 1, | |
WRAP_PARTIAL_FLAG = 32; | |
/** | |
* Creates a function that invokes `func` with the `this` binding of `thisArg` | |
* and `partials` prepended to the arguments it receives. | |
* | |
* The `_.bind.placeholder` value, which defaults to `_` in monolithic builds, | |
* may be used as a placeholder for partially applied arguments. | |
* | |
* **Note:** Unlike native `Function#bind`, this method doesn't set the "length" | |
* property of bound functions. | |
* | |
* @static | |
* @memberOf _ | |
* @since 0.1.0 | |
* @category Function | |
* @param {Function} func The function to bind. | |
* @param {*} thisArg The `this` binding of `func`. | |
* @param {...*} [partials] The arguments to be partially applied. | |
* @returns {Function} Returns the new bound function. | |
* @example | |
* | |
* function greet(greeting, punctuation) { | |
* return greeting + ' ' + this.user + punctuation; | |
* } | |
* | |
* var object = { 'user': 'fred' }; | |
* | |
* var bound = _.bind(greet, object, 'hi'); | |
* bound('!'); | |
* // => 'hi fred!' | |
* | |
* // Bound with placeholders. | |
* var bound = _.bind(greet, object, _, '!'); | |
* bound('hi'); | |
* // => 'hi fred!' | |
*/ | |
var bind = baseRest(function(func, thisArg, partials) { | |
var bitmask = WRAP_BIND_FLAG; | |
if (partials.length) { | |
var holders = replaceHolders(partials, getHolder(bind)); | |
bitmask |= WRAP_PARTIAL_FLAG; | |
} | |
return createWrap(func, bitmask, thisArg, partials, holders); | |
}); | |
// Assign default placeholders. | |
bind.placeholder = {}; | |
module.exports = bind; | |