concactenate-arrays-assignment.js

function concat(z, y) {
  for (var i = 0; i < y.length; i++) {
    z.push(y[i]);
  }

  return z;

}


console.log(concat([ 1, 2, 3 ], [ 4, 5, 6 ]), "=?", [ 1, 2, 3, 4, 5, 6 ]);
console.log(concat([ 0, 3, 1 ], [ 9, 7, 2 ]), "=?", [ 0, 3, 1, 9, 7, 2 ]);
console.log(concat([], [ 9, 7, 2 ]), "=?", [ 9, 7, 2 ]);
console.log(concat([ 5, 10 ], []), "=?", [ 5, 10 ]);