Underscore.JS - findWhere method

Syntax

_.findWhere(list, properties)

Looks through each value in the list, returning first matched pair that matches the key-value pairs listed in properties.

Example

var _ = require('underscore');

var list = [{"title": "Learn Java", "Author": "Sam", "Cost": 100},
   {"title": "Learn Scala", "Author": "Joe", "Cost": 200},
   {"title": "Learn C", "Author": "Sam", "Cost": 200} ]
   
//Example 1. find a book whose author is Sam
var result = _.findWhere(list, { "Author": "Sam" });
console.log(result);

//Example 2. find a book whose cost is 200
var result = _.findWhere(list, { "Cost": 200 });
console.log(result);

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

Command

\>node tester.js

Output

{ title: 'Learn Java', Author: 'Sam', Cost: 100 }
{ title: 'Learn Scala', Author: 'Joe', Cost: 200 }