51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
|
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;
|