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Functions · easy

4. Functions

Declarations, expressions, and arrow functions.

1 min read3 questionsup to 50 XPtopic 4/50

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Function declarations are hoisted; arrow functions capture `this` lexically and do not bind their own `arguments`.

js
function double(n) { return n * 2; }
const add = (a, b) => a + b;

How to study this topic

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  2. 2. Re-read the code snippets and say out loud what each line does.
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Check your understanding

  1. 1. What is true of arrow functions?

  2. 2. Which form is hoisted?

  3. 3. What replaces `arguments` in modern code?

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