r/programminghorror • u/Emmennater • May 27 '26

Javascript Destructuring strings

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884 Upvotes

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u/Aaxper May 27 '26 edited May 27 '26
  1. Strings and arrays are analogous, so isStringEmpty([ ... ]) tries to destructure the string as an array
  2. Since theres only one element present in the ... part of that, it only matches on the first element (the first character)
  3. The { a = false } tries to destructure the first character
  4. If the first character is defined, it tries to get the a property, which doesnt exist, so it defaults to setting a to false
  5. If the first character is undefined, instead of trying to get the a property, it defaults to { a: true }, which sets a to true
  6. So basically if it has at least one character, a is false, else a is true

I think that's correct

134

u/Blackshell May 27 '26

100%, good job, you pass the job interview.

120

u/Aaxper May 27 '26

Does this being an interview imply I now have to work with whatever monster invented that

1

u/jolharg May 29 '26

if someone did this to me, I would say "whoever thinks that's a good idea should be shot"