Multi-Dimensional Array

JavaScript
1

I have an array, called, “myArray”. Inside this myArray are 4 more arrays, “m0, m1, m2, m3”.
How do I access all the elements in all the array?

Here’s my code, :

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>

<body>
<script>
var m0 = [0, 1, 2, 3, 4];
var m1 = [5, 6, 7, 8, 9];
var m2 = [10, 11, 12, 13, 14];
var m3 = [15, 16, 17, 18, 19];

var myArray = [m0, m1, m2, m3];


for (var i = 0; i < myArray.length; i++) {
    for (var j = 0; j < ("m"+i).length; j++) {
        document.writeln(myArray[i][j]);
    }
}
</script>
</body>
</html>

This code only give me the first 2 elements in each array.
But, I would like to get all the elements in all the arrays.

tks

2

Hi there,

The problemn is with this line:

for (var j = 0; j < ("m"+i).length; j++) {

"m"+i will evaluate to a two character string (e.g. “m0”, “m1” etc), which will have the length of two (hence only the first two elements being output).

You can do what you want like this instead:

var m0 = [0, 1, 2, 3, 4];
var m1 = [5, 6, 7, 8, 9];
var m2 = [10, 11, 12, 13, 14];
var m3 = [15, 16, 17, 18, 19];
var myArray = [m0, m1, m2, m3];

for (i = 0; i < myArray.length; i++) {
  console.log('myArray[' + i + '] contains: ');
  for (j = 0; j < myArray[i].length; j++) {
    console.log(myArray[i][j]);
  }
  console.log('\\r');
}