| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize modern exports="node" -o ./modern/` |
| * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/> |
| * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE> |
| * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors |
| * Available under MIT license <http://lodash.com/license> |
| */ |
| var baseFlatten = require('../internals/baseFlatten'), |
| createCallback = require('../functions/createCallback'), |
| forIn = require('./forIn'), |
| isObject = require('./isObject'); |
| |
| /** |
| * Creates a shallow clone of `object` composed of the specified properties. |
| * Property names may be specified as individual arguments or as arrays of |
| * property names. If a callback is provided it will be executed for each |
| * property of `object` picking the properties the callback returns truey |
| * for. The callback is bound to `thisArg` and invoked with three arguments; |
| * (value, key, object). |
| * |
| * @static |
| * @memberOf _ |
| * @category Objects |
| * @param {Object} object The source object. |
| * @param {Function|...string|string[]} [callback] The function called per |
| * iteration or property names to pick, specified as individual property |
| * names or arrays of property names. |
| * @param {*} [thisArg] The `this` binding of `callback`. |
| * @returns {Object} Returns an object composed of the picked properties. |
| * @example |
| * |
| * _.pick({ 'name': 'fred', '_userid': 'fred1' }, 'name'); |
| * // => { 'name': 'fred' } |
| * |
| * _.pick({ 'name': 'fred', '_userid': 'fred1' }, function(value, key) { |
| * return key.charAt(0) != '_'; |
| * }); |
| * // => { 'name': 'fred' } |
| */ |
| function pick(object, callback, thisArg) { |
| var result = {}; |
| if (typeof callback != 'function') { |
| var index = -1, |
| props = baseFlatten(arguments, true, false, 1), |
| length = isObject(object) ? props.length : 0; |
| |
| while (++index < length) { |
| var key = props[index]; |
| if (key in object) { |
| result[key] = object[key]; |
| } |
| } |
| } else { |
| callback = createCallback(callback, thisArg, 3); |
| forIn(object, function(value, key, object) { |
| if (callback(value, key, object)) { |
| result[key] = value; |
| } |
| }); |
| } |
| return result; |
| } |
| |
| module.exports = pick; |