The _.selectKeys() method returns a copy of obj containing only the properties listed in the given array.
Syntax:
_.omitWhen( Object_name, array );
Parameters:
- Object_name: Object from which the key/value pair is to be selected.
- array: Given array containing the properties to be listed.
Return Value: This method returns a copy of the object containing the properties listed.
Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed.
Underscore.js contrib library can be installed using npm install underscore-contrib –save.
Example 1:
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); var obj = { 1: "Gfg1", 2: "Gfg2", 3: "Gfg3"}; var val = _.selectKeys(obj, [1, 3]); console.log(val); |
Output:
{ '1': 'Gfg1', '3': 'Gfg3' }
Example 2: If no property is found in the object, this method returns an empty object.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); var obj = { 1: "Gfg1", 2: "Gfg2", 3: "Gfg3"}; var val = _.selectKeys(obj, [4]); console.log(val); |
Output:
{}
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