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JavaScript: Returns n rows by n columns identity matrix

JavaScript Function: Exercise-10 with Solution

Write a JavaScript function which returns the n rows by n columns identity matrix.

Pictorial Presentation:

JavaScript: Returns n rows by n columns identity matrix

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Returns the n rows by n columns identity matrix</title>
</head>
<body>
  
</body>
</html>

JavaScript Code:

function matrix(n) {

        var i;
        var j;

        for (i=0; i < n; i++)
        {
          for (j=0; j < n; j++)
          {
               if (i === j)
               {
                
                 console.log(' 1 ');
               }
                      
               else 
                {
                 console.log(' 0 ');}
                }
             console.log('----------');
           }
       }
matrix(4);

Sample Output:

 1 
 0 
 0 
 0 
----------
 0 
 1 
 0 
 0 
----------
 0 
 0 
 1 
 0 
----------
 0 
 0 
 0 
 1 
----------

Flowchart:

Flowchart: JavaScript function: Returns n rows by n columns identity matrix

Live Demo:

See the Pen JavaScript -Returns n rows by n columns identity matrix-function-ex- 10 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Shorten an array using its length property

A great way of shortening an array is by redefining its length property.

let array = [0, 1, 2, 3, 4, 5, 6, 6, 8, 9]
array.length = 4
// Result: [0, 1, 2, 3]

Important to know though is that this is a destructive way of changing the array. This means you lose all the other values that used to be in the array.

Ref: https://bit.ly/2LBj213