What this snippet does
inner retains access to count even after outer has returned — this is a closure.
Expected output
1 2 3
Why practise typing this
Typing closures 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
- closure counterClosures · intermediate
- var loop bindingClosures · intermediate
- closure factoryClosures · intermediate
- memoizationClosures · intermediate
- partial applicationClosures · intermediate
- private closureClosures · intermediate