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The App Code

JavaScript & React

The web platform language plus the React library. Covers browser APIs, async patterns, and idiomatic component-level techniques.

How-to

Debounce a Function in JavaScript

Delay running a function until input stops arriving, using a timer that resets on each call.

 How-to

Fetch Data in React with useEffect

Load data on mount inside useEffect, storing the result in state and cleaning up to avoid setting state after unmount.

 How-to

Make a GET Request in JavaScript

Fetch JSON from an API in the browser or Node using the async fetch API.

 How-to

Remove Duplicates from an Array in JavaScript

Deduplicate an array by passing it through a Set and spreading it back to an array.