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.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that returns true if a string starts with a valid protocol (http, https, ftp) indicating an absolute URL.
• Write a JavaScript function that uses regular expressions to test if a URL is absolute.
• Write a JavaScript program that checks if a URL string contains a valid domain and protocol.
• Write a JavaScript function that validates URL format and returns true if it’s an absolute URL.

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