What this snippet does
Strings have dozens of built-in methods — includes, startsWith, endsWith are cleaner than indexOf for existence checks.
Expected output
13 HELLO, WORLD! hello, world! true true true 4
Why practise typing this
Typing strings 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.
More JavaScript practice
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