Learn / JavaScript: Functions & Data
Functions & closures
Higher-order functions and the closures that give them memory.
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10 lessons a month on the free tier.
Lessons in this class
JavaScript: Functions & Data
Functions are values: pass them, return them, close over state.
- Declare a function
- Arrow functions
- Functions that take functions
- Closures
Also coming to this class
Callbacks in depth
How CodeTrain teaches this
No videos and no multiple-choice quiz at the end. Each lesson is a handful of small steps in a real editor. You type the code yourself, it runs, and the tutor reviews what you actually wrote. It will not hand you the answer, and the step doesn't advance until your code passes. What you get at the end is a record of which steps you wrote unaided, not a completion percentage.