Lodash - union method

Syntax

_.union([arrays])

Creates an array of unique values, in order, from all given arrays using SameValueZero for equality comparisons.

Arguments

• [arrays] (...Array) − The array to inspect.

Output

• (Array) − Returns the new array of combined values.

Example

var _ = require('lodash');
var numbers = [1, 2, 3, 4]

var result = _.union(numbers, [2]);
console.log(result);

var result = _.union(numbers, [2, 5]);
console.log(result);

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

Command

\>node tester.js

Output

[ 1, 2, 3, 4 ]
[ 1, 2, 3, 4, 5 ]