What this snippet does
push/pop work on the end; unshift/shift work on the front — all four mutate the original array.
Expected output
[ 1, 2, 3, 4, 5 ] [ 2, 3, 4 ] 1 5
Why practise typing this
Typing arrays 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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