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:

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:

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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Next: Write a JavaScript function which will take an array of numbers stored and find the second lowest and second greatest numbers, respectively.
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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
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