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Beginner’s guide to JS
Beginner’s guide to JS
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20 units · 11 min · Easy
Overview
What is JavaScript & how browsers run it
3 min
Variables & data types (let, const, strings, numbers, booleans)
4 min
Operators & expressions (arithmetic, comparison, logical)
3 min
Comments in JS
Conditionals (if, else if, else, switch)
Loops (for, while, for...of)
Writing & calling functions
Parameters, arguments & return values
Arrow functions
Arrays — creating, accessing, and looping
Objects — key-value pairs and dot notation
Array methods (map, filter, forEach)
The DOM — what it is and how JS reads it
Selecting & manipulating HTML elements
Events — clicks, inputs, and listeners
Forms & user input with JS
setTimeout & setInterval — timing
Working with JSON
Fetch API — loading data from the web
Debugging — console, errors, and DevTools
Unit 12 of 20
Array methods (map, filter, forEach)
Updated Jun 2026
This unit has no content yet.
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Objects — key-value pairs and dot notation
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