What this snippet does
Stack's LIFO property is perfect for matching open/close pairs — the last opened must be the first closed.
Expected output
true false
Why practise typing this
Typing data structures 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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