The concat() method concatenates (joins) two or more arrays.It returns a new array, containing the joined arrays. It does not change the existing arrays.
Example :
const array1 = ['a', 'b', 'c'];
const array2 = ['d', 'e', 'f'];
const array3 = array1.concat(array2);
console.log(array3);
//Output: Array ["a", "b", "c", "d", "e", "f"]
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