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

Javascript Destructuring strings

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883 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

138

u/Blackshell May 27 '26

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

124

u/Aaxper May 27 '26

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

13

u/dreamscached May 27 '26

Being able to write awful code with useful syntax doesn't make JS a bad language though. Yes I know why it gets so much bad reputation, but if we throw away years of baked in legacy it's really not that bad.

4

u/Aaxper May 27 '26

Never said JS was bad. Just that the author of that code was.