1: Fundamentals
2: HTML and CSS
3: Tools
4: Deployment
5: JavaScript
6: More JavaScript
7: TypeScript
8: Python
9: More Python
10: PHP
11: More CSS
12: DOM and Events
13: Networking
14: Browser API
15: Server Runtimes
16: HTTP Servers
17: Forms
18: Databases
19: Libraries and frameworks
20: Docker
21: Go
22: C
23: Linux
24: Swift
25: Electronics
26: Misc

Copyright 2025

The Valley of Code

A Flavio Copes project

changelog

legacy pro user?

The String toLowerCase() method
Find out all about the JavaScript toLowerCase() method of a string

Return a new string with the text all in lower case.

Does not mutate the original string.

Does not accept any parameter.

Usage:

'Testing'.toLowerCase() //'testing'

Works similarly to toLocaleLowerCase(), but does not consider locales at all.

Want to master TypeScript? Check out my TypeScript Masterclass

Join my AI Workshop !

The Web Development BOOTCAMP cohort starts in February 2026