Collect.js concat() Method

The concat() method is used to return the merged arrays or objects represented by the collection. The JavaScript array is first transformed into a collection and then the function is applied to the collection.

Syntax:

collect(array1).concat(array2)

Parameters: The collect() method takes one argument that is converted into the collection and then concat() function also take an array.

Return Value: Returns a merged array or object.

Below examples illustrate the concat() method in Collect.js:

Example 1: Here collect = require(‘collect.js’) is used to import the collect.js library into the file.

Javascript

const collect = require('collect.js');

let arr = [1, 2, 3]

// Convert array into collection
const collection = collect(arr);

// concat the array
let concatarr = collection.concat(['a', 'b', 'c']);

// Returning the array
let newObject =  concatarr.all();

console.log("Result : ", newObject);

Output:

Result :  [ 1, 2, 3, 'a', 'b', 'c' ]

Example 2:

Javascript

const collect = require('collect.js');

let arr = [1, 2, 3]

// Convert array into collection
const collection = collect(arr);

// concat the array
let concatarr = collection.concat(['a', 'b', 'c']);

// concat the object
concatarr = concatarr.concat({ first : "GeeksforGeeks",
        second : "Collect.js"});

// Returning the array
let newObject =  concatarr.all();

console.log("Result : ", newObject);

Output:

Result :  [ 1, 2, 3, 'a', 'b', 'c', 'GeeksforGeeks', 'Collect.js' ]

Reference: https://collect.js.org/api/concat.html