forked from kevin.shehu/GGD
58 lines
1.7 KiB
JavaScript
58 lines
1.7 KiB
JavaScript
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;
|