JavaScript Function Learning Path
Functions Learning Path
Learn functions in the right order:
- First the idea
- Then how to write them
- Then how they behave
Functions Learning Path
Learn functions in this order:
IIFE (Advanced)
Functions that run immediately (mostly historical, still useful sometimes).
Intermediate
Advanced Functions Learning Path
Quick Start
Step 1
The this Keyword
How this works (especially inside objects).
How this is decided by how it is called.
Advanced
Step 3
apply(): Like call(), but arguments as an array
Use apply() when you already have an array of values.
Advanced
Step 4
bind(): Create a new function with fixed this
Use bind() when you need a function to run later with the same this.
Advanced
Step 5
Closures: Functions Remember Their Scope
Learn how functions can remember variables after the outer function finishes.
Advanced
Step 6
Function References and Callbacks
Pass functions as values and avoid common callback mistakes.
Advanced
