What this snippet does
Partial application fixes some arguments upfront and returns a function waiting for the rest — a practical use of closures.
Expected output
10 15 20
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 basicsClosures · intermediate
- closure counterClosures · intermediate
- var loop bindingClosures · intermediate
- closure factoryClosures · intermediate
- memoizationClosures · intermediate
- private closureClosures · intermediate