Underscore.JS - pick method

Syntax

_.pick(object, *keys)

pick method return a copy of object by copies the specified keys to be copied. We can pass a predicate as well instead of keys to determine keys to be copied. See the below example −

Example

var _ = require('underscore');

var student = { name : 'Sam', age: 30, id: 1};

// Example 1: use pick to copy name and age
var student1 = _.pick(student, 'name', 'age');
console.log(student1);

// Example 2: use pick to copy age and id using function
student1 = _.pick(student, function(value){ return _.isNumber(value)});
console.log(student1);

Save the above program in tester.js. Run the following command to execute this program.

Command

\>node tester.js

Output

{ name: 'Sam', age: 30 }
{ age: 30, id: 1 }