What this snippet does
Factory functions with closures provide true privacy — unlike class properties, the private variables are physically inaccessible.
Expected output
Alice logged in (1x) Alice logged in (2x) Alice undefined
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
- partial applicationClosures · intermediate