JavaScript: Check whether a matrix is a diagonal matrix or not
JavaScript Basic: Exercise-115 with Solution
Write a JavaScript program to check whether a matrix is a diagonal matrix or not. In linear algebra, a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero (the diagonal from the upper left to the lower right).
Example:
[1, 0, 0], [0, 2, 0], [0, 0, 3] ]) = true
[1, 0, 0], [0, 2, 3], [0, 0, 3] ]) = false
Pictorial Presentation:

Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Check whether a matrix is a diagonal matrix or not</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function is_diagonal_matrix(user_matrix) {
for (var i = 0; i < user_matrix.length; i++) {
for (var j = 0; j < user_matrix.length; j++) {
if (i !== j && user_matrix[i][j] !== 0)
return false;
}
}
return true;
}
console.log(is_diagonal_matrix([[1, 0, 0], [0, 2, 0], [0, 0, 3] ]));
console.log(is_diagonal_matrix([[1, 0, 0], [0, 2, 3], [0, 0, 3] ]));
Sample Output:
true false
Flowchart:

ES6 Version:
function is_diagonal_matrix(user_matrix) {
for (let i = 0; i < user_matrix.length; i++) {
for (let j = 0; j < user_matrix.length; j++) {
if (i !== j && user_matrix[i][j] !== 0)
return false;
}
}
return true;
}
console.log(is_diagonal_matrix([[1, 0, 0], [0, 2, 0], [0, 0, 3] ]));
console.log(is_diagonal_matrix([[1, 0, 0], [0, 2, 3], [0, 0, 3] ]));
Live Demo:
See the Pen javascript-basic-exercise-115 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
Parse an HTTP Cookie header string and return an object of all cookie name-value pairs
Example:
const parseCookie = str => str .split(';') .map(v => v.split('=')) .reduce((acc, v) => { acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim()); return acc; }, {}); console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2')); // { foo: 'bar', equation: 'E=mc^2' }
Output:
[object Object] { equation: "E=mc^2", foo: "bar" }
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