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JavaScript Tutorials

JavaScript and jQuery guides for the browser and beyond — events, DOM work and debugging.

46 tutorials

Web Development

How to Add the Required Attribute to Input Fields with jQuery

May 22, 2026 · 3 min read Web Development

Conditional Rendering with React.createElement

May 22, 2026 · 4 min read Web Development

How to Check if a JavaScript String Contains a Unicode Character

May 22, 2026 · 4 min read Web Development

How to Format a Number with Decimals in JavaScript

May 22, 2026 · 3 min read Web Development

How to Check if a JavaScript String Is a Valid URL

May 22, 2026 · 4 min read Web Development

How to Install Node.js on Ubuntu (22.04 & 24.04): Step-by-Step

April 16, 2026 · 7 min read Web Development

How to Find Prime Numbers in JavaScript (1 to 100) — Fast & Simple Methods

February 6, 2026 · 3 min read Web Development

Capitalize All Words in JavaScript (ucwords Equivalent) + First Letter Uppercase

February 6, 2026 · 4 min read Web Development

How to Use localStorage in JavaScript (With Real Examples + Troubleshooting)

February 6, 2026 · 5 min read Web Development

Replace Broken Images Automatically with JavaScript (and jQuery)

March 13, 2021 · 3 min read

These JavaScript guides come from the same library as the rest of How7o Learn: each one documents a real task or a real failure, and the exact steps that resolved it.