concat And join Array method || JS Tutorial for Beginners in 2022

Welcome To Code Bengali Channel we will see concat And join Array.

Definition and Usage
The concat() method concatenates (joins) two or more arrays.

The concat() method returns a new array, containing the joined arrays.

The concat() method does not change the existing arrays.

Syntax
array1.concat(array2, array3, ..., arrayX)

Examples
Join two arrays:

const arr1 = ["Cecilie", "Lone"];
const arr2 = ["Emil", "Tobias", "Linus"];
const children = arr1.concat(arr2);

Join three arrays:

const arr1 = ["Cecilie", "Lone"];
const arr2 = ["Emil", "Tobias", "Linus"];
const arr3 = ["Robin"];
const children = arr1.concat(arr2,arr3);

Definition and Usage
The join() method returns an array as a string.

The join() method does not change the original array.

Any separator can be specified. The default is comma (,).

Syntax
array.join(separator)

Examples
const fruits = ["Banana", "Orange", "Apple", "Mango"];
let text = fruits.join();

Another separator:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
let text = fruits.join(" and ");

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