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How to create two dimensional array in JavaScript?

  • Difficulty Level : Medium
  • Last Updated : 26 Jul, 2021

The two-dimensional array is a collection of items which share a common name and they are organized as a matrix in the form of rows and columns. The two-dimensional array is an array of arrays, so we create an array of one-dimensional array objects.
The following program shows how to create an 2D array : 
Example-1: 
 

Javascript




<script>
  
// Create one dimensional array
    var gfg = new Array(2);
  
document.write("Creating 2D array <br>");
  
// Loop to create 2D array using 1D array
for (var i = 0; i < gfg.length; i++) {
    gfg[i] = new Array(2);
}
  
var h = 0;
  
// Loop to initialize 2D array elements.
for (var i = 0; i < 2; i++) {
    for (var j = 0; j < 2; j++) {
        gfg[i][j] = h++;
    }
}
  
// Loop to display the elements of 2D array. 
for (var i = 0; i < 2; i++) {
    for (var j = 0; j < 2; j++)    {
        document.write(gfg[i][j] + " ");
    }
    document.write("<br>");
</script>                    

Output: 
 

Creating 2D array
0 1 
2 3 

 

Example-2: 
 

javascript




<script>
  
// Create one dimensional array
var gfg = new Array(3);
  
// Loop to create 2D array using 1D array
document.write("Creating 2D array <br>");
for (var i = 0; i < gfg.length; i++) {
    gfg[i] = [];
}
var h = 0;
var s = "GeeksforGeeks";
  
// Loop to initialize 2D array elements.
for (var i = 0; i < 3; i++) {
    for (var j = 0; j < 3; j++) {
  
        gfg[i][j] = s[h++];
    }
}
  
// Loop to display the elements of 2D array.
for (var i = 0; i < 3; i++) {
    for (var j = 0; j < 3; j++)
  
    {
        document.write(gfg[i][j] + " ");
    }
    document.write("<br>");
}
  
</script>                    

Output: 
 

Creating 2D array
G e e 
k s f 
o r G 

 

 

JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.




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