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Which of these javascript expressions is false? (lemmy.ml)

submitted 1 week ago by [email protected] to c/[email protected]

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[–] [email protected] 15 points 6 days ago (1 children)

I love the two lonely downvotes on this.

[–] [email protected] 5 points 6 days ago (1 children)

Merging the upvotes and downvotes is the best option

[–] [email protected] 8 points 6 days ago

nah, it's more fun this way.

[–] [email protected] 7 points 5 days ago

If you thought this was fun you might like https://jsisweird.com/ with similar questions

[–] [email protected] 5 points 6 days ago

[–] [email protected] 83 points 1 week ago (29 children)

I'm no expert and I know that javascript is full of wtf moments, but please.. Let it be B

It's not gong to be B, it's it.

[–] [email protected] 12 points 6 days ago

Narrator: "It wasn't B."

[–] [email protected] 97 points 1 week ago (9 children)

It is true. Math.min() returns positive Infinity when called with no arguments and Math.max() returns Negative Infinity when called with no arguments. Positive Infinity > Negative Infinity.

Math.min() works something like this

def min(numbers):
  r = Infinity
  for n in numbers:
    if n < r:
      r = n
  return r

I'm guessing there's a reason they wanted min() to be able to be called without any arguments but I'm sure it isn't a good one.

[–] [email protected] 4 points 5 days ago

I’m guessing there’s a reason they wanted min() to be able to be called without any arguments but I’m sure it isn’t a good one.

It not a totally unreasonable definition. For example it preserves nice properties like min(a.concat(b)) == min([min(a), min(b)]).

Obviously the correct thing to do is to return an optional type, like Rust does. But ... yeah I mean considering the other footguns in Javascript (e.g. the insane implicit type coersion) I'd say they didn't do too badly here.

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[–] [email protected] 72 points 1 week ago (3 children)

It's C

[–] [email protected] 11 points 6 days ago (1 children)

Wtf? Min > Max???

[–] [email protected] 19 points 6 days ago* (last edited 6 days ago) (1 children)

Math.min isn’t the minimum integer; it’s the minimum of a list (and max visa versa)… the min/max of an undefined list is the same… IDK what it is, but this probably the most reasonable of the “WTFs” they could have put there i think… other languages would throw an exception or not compile (which JS definitely SHOULD do instead of this, buuuuut lots of JS has aversions to errors)

*edit: okay the curiosity was killing me: Math.min() is Infinity and Math.max() is -Infinity