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JavaScript: Get the extension of a filename

JavaScript Basic: Exercise-14 with Solution

Write a JavaScript exercise to get the extension of a filename.

Pictorial Presentation:

JavaScript: Get the extension of a filename

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>The extension of a filename.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

filename = "system.php"
console.log(filename.split('.').pop());
filename = "abc.js"
console.log(filename.split('.').pop());

Sample Output:

php
js

ES6 Version:

filename = "system.php"
console.log(filename.split('.').pop());
filename = "abc.js"
console.log(filename.split('.').pop());

Live Demo:

See the Pen JavaScript: Extension of a filename - basic-ex-14 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925 

Output:

385
3025
2925