How to Merge Two Arrays in JavaScript?

We can merge two arrays in JavaScript using the concat() method. Here’s an example:

const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const mergedArray = array1.concat(array2);
 

This will create a new array mergedArray that contains all the elements of array1 and array2 in the same order as they were inserted into the original arrays .

If you want to remove duplicates from the merged array, you can use the Set object. Here’s an example:

const array1 = [1, 2, 3];
const array2 = [2, 3, 4];
const mergedArray = [...new Set([...array1, ...array2])];
 

This will create a new array mergedArray that contains all the unique elements of array1 and array2 in the same order as they were inserted into the original arrays.