JavaScript: Return true if the given string is an absolute URL, false otherwise

JavaScript fundamental (ES6 Syntax): Exercise-207 with Solution

Check Absolute URL

Write a JavaScript program that returns true if the given string is an absolute URL, false otherwise.

• Use RegExp.prototype.test() to test if the string is an absolute URL.

Sample Solution:

JavaScript Code:

// Define a function 'isAbsoluteURL' that checks if the input string is an absolute URL
const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);

// Test cases to check if the input strings are absolute URLs
console.log(isAbsoluteURL('https://google.com')); // true (starts with 'https://')
console.log(isAbsoluteURL('ftp://www.myserver.net')); // true (starts with 'ftp://')
console.log(isAbsoluteURL('/foo/bar')); // false (does not start with a protocol)

Output:

true
true
false

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-207-1 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to check if a given string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).
Next: Write a JavaScript program to check whether the provided value is of the specified type.