numerically populating a 2d array

Question

Javascript is new to me so I'm trying to learn. Mostly with unstable succes-rates...

In this case, I would like to populate a 2D array with a double for loop, but the code is not running properly. Could somebody point out the problem in the code or help me to fix it?

the code is:

 function 2d_array() { var x = 2; var y = 3 var A = [1, 2, 3]; var B = [4, 5, 6]; var z = [][]; for (var i = 0; i < 3; i++) { for (var j = 0; j < 3; j++) { z[i][j] = x * A[i] + y * B[j]; } } return z[1][1] } 

It would really help me out alot. Thanks, Bas

Answer 1

There are multiple problems with your code.

1. Function names must begin with a letter
2. var z=[][]; is incorrect syntax.

This should work:

function array_2d() {

  var x = 2;
  var y = 3
  var A = [1, 2, 3];
  var B = [4, 5, 6];
  var z = [];

  for (var i = 0; i < 3; i++) {
    z[i] = [];
    for (var j = 0; j < 3; j++) {
      z[i][j] = x * A[i] + y * B[j];
    }
  }
  return z[1][1]
}