What this snippet does
Skip positions with empty commas; collect the rest with ...rest — positional unpacking unlike object destructuring.
Expected output
1 2 3 10 30 1 [ 2, 3, 4, 5 ]
Why practise typing this
Typing destructuring 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
- object destructureDestructuring · beginner
- nested destructureDestructuring · intermediate
- param destructureDestructuring · intermediate
- swap variablesDestructuring · beginner
- iterable destructureDestructuring · intermediate
- let vs constVariables · beginner