Javascript is the most popular scripting language in use today

theopold@lemmy.world to Programmer Humor@programming.dev – 346 points –

Explanation: it's mostly due to how js does type conversion. for the Ls, it's

[] is an empty array ![] is treated as false combining a boolean with the empty array returns "false" as a string (so true + [] = "true", false + [] = "false") ! + [] is treated as true ! + [] + ! + [] is treated as 2 since true + true = 1 + 1 = 2 so you have "false"[2], which is l for the o it's [] is an empty array [] + {} returns "[object Object]" as a string ({} + [] returns 0) ![] is false !![] is true +!![] casts it to an integer so that part is "[object Object]"[1], which returns "o"

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The explanation is about as understandable as the JS code, however thanks OP, TIL

The line breaks haven't worked, here's it formatted correctly:

Explanation: it's mostly due to how js does type conversion.

For the Ls, it's:

  • [] is an empty array
  • ![] is treated as false
  • combining a boolean with the empty array returns "false" as a string (so true + [] = "true", false + [] = "false")
  • ! + [] is treated as true
  • ! + [] + ! + [] is treated as 2 since true + true = 1 + 1 = 2
  • so you have "false"[2], which is l

for the o it's:

  • [] is an empty array
  • [] + {} returns "[object Object]" as a string ({} + [] returns 0)
  • ![] is false
  • !![] is true
  • +!![] casts it to an integer
  • so that part is "[object Object]"[1], which returns "o"-

The idea behind it is not that complicated to explain... They set up a construct that spits out the word "false" and one that spits out "[object Object]". Taking the character with the Index of 2 from "false" gives us the "l" (the "2" to use as the index is of course also created using only brackets and parentheses). The character with the index of 1 from "[object Object]" is "o". So we have everything we need to spell out "lol".