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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_PARTIAL_FLAG = 32; | |
/** | |
* Creates a function that invokes `func` with `partials` prepended to the | |
* arguments it receives. This method is like `_.bind` except it does **not** | |
* alter the `this` binding. | |
* | |
* The `_.partial.placeholder` value, which defaults to `_` in monolithic | |
* builds, may be used as a placeholder for partially applied arguments. | |
* | |
* **Note:** This method doesn't set the "length" property of partially | |
* applied functions. | |
* | |
* @static | |
* @memberOf _ | |
* @since 0.2.0 | |
* @category Function | |
* @param {Function} func The function to partially apply arguments to. | |
* @param {...*} [partials] The arguments to be partially applied. | |
* @returns {Function} Returns the new partially applied function. | |
* @example | |
* | |
* function greet(greeting, name) { | |
* return greeting + ' ' + name; | |
* } | |
* | |
* var sayHelloTo = _.partial(greet, 'hello'); | |
* sayHelloTo('fred'); | |
* // => 'hello fred' | |
* | |
* // Partially applied with placeholders. | |
* var greetFred = _.partial(greet, _, 'fred'); | |
* greetFred('hi'); | |
* // => 'hi fred' | |
*/ | |
var partial = baseRest(function(func, partials) { | |
var holders = replaceHolders(partials, getHolder(partial)); | |
return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders); | |
}); | |
// Assign default placeholders. | |
partial.placeholder = {}; | |
module.exports = partial; | |