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Beginner’s guide to JS
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Beginner’s guide to JS
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20 units · Easy
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Overview
1
What is JavaScript & how browsers run it
2
Variables & data types (let, const, strings, numbers, booleans)
3
Operators & expressions (arithmetic, comparison, logical)
4
Comments in JS
5
Conditionals (if, else if, else, switch)
6
Loops (for, while, for...of)
7
Writing & calling functions
8
Parameters, arguments & return values
9
Arrow functions
10
Arrays — creating, accessing, and looping
11
Objects — key-value pairs and dot notation
12
Array methods (map, filter, forEach)
13
The DOM — what it is and how JS reads it
14
Selecting & manipulating HTML elements
15
Events — clicks, inputs, and listeners
16
Forms & user input with JS
17
setTimeout & setInterval — timing
18
Working with JSON
19
Fetch API — loading data from the web
20
Debugging — console, errors, and DevTools
Unit 8 of 20
Parameters, arguments & return values
Updated Jun 2026
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