What this snippet does
Lenses abstract getting and setting nested fields — they are composable and always produce new objects without mutation.
Expected output
Alice ALICE Alice
Why practise typing this
Typing functional patterns 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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