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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