You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
2.0 KiB
68 lines
2.0 KiB
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_BIND_KEY_FLAG = 2,
|
|
WRAP_PARTIAL_FLAG = 32;
|
|
|
|
/**
|
|
* Creates a function that invokes the method at `object[key]` with `partials`
|
|
* prepended to the arguments it receives.
|
|
*
|
|
* This method differs from `_.bind` by allowing bound functions to reference
|
|
* methods that may be redefined or don't yet exist. See
|
|
* [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
|
|
* for more details.
|
|
*
|
|
* The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
|
|
* builds, may be used as a placeholder for partially applied arguments.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 0.10.0
|
|
* @category Function
|
|
* @param {Object} object The object to invoke the method on.
|
|
* @param {string} key The key of the method.
|
|
* @param {...*} [partials] The arguments to be partially applied.
|
|
* @returns {Function} Returns the new bound function.
|
|
* @example
|
|
*
|
|
* var object = {
|
|
* 'user': 'fred',
|
|
* 'greet': function(greeting, punctuation) {
|
|
* return greeting + ' ' + this.user + punctuation;
|
|
* }
|
|
* };
|
|
*
|
|
* var bound = _.bindKey(object, 'greet', 'hi');
|
|
* bound('!');
|
|
* // => 'hi fred!'
|
|
*
|
|
* object.greet = function(greeting, punctuation) {
|
|
* return greeting + 'ya ' + this.user + punctuation;
|
|
* };
|
|
*
|
|
* bound('!');
|
|
* // => 'hiya fred!'
|
|
*
|
|
* // Bound with placeholders.
|
|
* var bound = _.bindKey(object, 'greet', _, '!');
|
|
* bound('hi');
|
|
* // => 'hiya fred!'
|
|
*/
|
|
var bindKey = baseRest(function(object, key, partials) {
|
|
var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
|
|
if (partials.length) {
|
|
var holders = replaceHolders(partials, getHolder(bindKey));
|
|
bitmask |= WRAP_PARTIAL_FLAG;
|
|
}
|
|
return createWrap(key, bitmask, object, partials, holders);
|
|
});
|
|
|
|
// Assign default placeholders.
|
|
bindKey.placeholder = {};
|
|
|
|
module.exports = bindKey;
|