What this snippet does
Default parameters activate only when the argument is undefined — not when it is null or 0.
Expected output
Hello, stranger! Hello, Alice! Hi, Bob! Hey, stranger!
Why practise typing this
Typing functions 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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