Web Development / JavaScript
Lesson 18 of 30
Functions and arrow functions
Functions work like Python's. Arrow functions are a shorter way to write them.
Key points
- function add(a, b) { return a + b; }
- const add = (a, b) => a + b;
- Functions can be passed around
const double = (n) => n * 2;
console.log([1, 2, 3].map(double)); // [2, 4, 6]Quiz · +10 XP
What does [1, 2, 3].map(n => n * 2) give?
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