You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
var baseCallback = require('../internal/baseCallback'),
|
|
isIterateeCall = require('../internal/isIterateeCall'),
|
|
isObjectLike = require('../internal/isObjectLike'),
|
|
matches = require('./matches');
|
|
|
|
/**
|
|
* Creates a function that invokes `func` with the `this` binding of `thisArg`
|
|
* and arguments of the created function. If `func` is a property name the
|
|
* created callback returns the property value for a given element. If `func`
|
|
* is an object the created callback returns `true` for elements that contain
|
|
* the equivalent object properties, otherwise it returns `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias iteratee
|
|
* @category Utility
|
|
* @param {*} [func=_.identity] The value to convert to a callback.
|
|
* @param {*} [thisArg] The `this` binding of `func`.
|
|
* @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
|
|
* @returns {Function} Returns the callback.
|
|
* @example
|
|
*
|
|
* var users = [
|
|
* { 'user': 'barney', 'age': 36 },
|
|
* { 'user': 'fred', 'age': 40 }
|
|
* ];
|
|
*
|
|
* // wrap to create custom callback shorthands
|
|
* _.callback = _.wrap(_.callback, function(callback, func, thisArg) {
|
|
* var match = /^(.+?)__([gl]t)(.+)$/.exec(func);
|
|
* if (!match) {
|
|
* return callback(func, thisArg);
|
|
* }
|
|
* return function(object) {
|
|
* return match[2] == 'gt'
|
|
* ? object[match[1]] > match[3]
|
|
* : object[match[1]] < match[3];
|
|
* };
|
|
* });
|
|
*
|
|
* _.filter(users, 'age__gt36');
|
|
* // => [{ 'user': 'fred', 'age': 40 }]
|
|
*/
|
|
function callback(func, thisArg, guard) {
|
|
if (guard && isIterateeCall(func, thisArg, guard)) {
|
|
thisArg = undefined;
|
|
}
|
|
return isObjectLike(func)
|
|
? matches(func)
|
|
: baseCallback(func, thisArg);
|
|
}
|
|
|
|
module.exports = callback;
|