JavaScript

class iterable in JavaScript

JavaScriptClassesSymbol.iterator in classadvanced

What this snippet does

Classes that implement Symbol.iterator work with for...of, spread, and destructuring — making them feel like native collections.

Expected output

[ 1, 2, 3, 4, 5 ]
1
2
3
4
5

Why practise typing this

Typing classes code builds muscle memory for the symbols and indentation JavaScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.

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