The concat() method of an array is used to merge two or more arrays.
    
    const numbers = [1, 2, 3];
    const numbers1 = [4, 5, 6];
    const numbers2 = numbers.concat(numbers1);
    console.log(numbers2);
    // [1, 2, 3, 4, 5, 6]
            
          The concat() method of an array is used to merge two or more arrays.
    
    const numbers = [1, 2, 3];
    const numbers1 = [4, 5, 6];
    const numbers2 = numbers.concat(numbers1);
    console.log(numbers2);
    // [1, 2, 3, 4, 5, 6]