The _.kv() method returns the key/value pair for a given property in an object, returns undefined if not found.
Syntax:
_.kv( Object_name, property );
Parameters:
- Object_name: Object from which the key/value pair is to be searched.
- property: Given the property of which given key/value pair is to be searched.
Return Value: This method returns the key/value pair for a given property.
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 ob = { "gfg" : "neveropen" }; var val = _.kv( ob, "gfg"); console.log(val); |
Output:
[ 'gfg', 'neveropen' ]
Example 2: if no key/value is found, this method returns undefined.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); var ob = { "gfg" : "neveropen" }; var val = _.kv( ob, "geek"); console.log(val); |
Output:
undefined
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