this post was submitted on 08 Mar 2024
10 points (100.0% liked)

Programmer Humor

32415 readers
328 users here now

Post funny things about programming here! (Or just rant about your favourite programming language.)

Rules:

founded 5 years ago
MODERATORS
 
you are viewing a single comment's thread
view the rest of the comments
[–] [email protected] 1 points 8 months ago (1 children)

300,000 every week... is this really a feature not built into Java Script?

[–] [email protected] 1 points 8 months ago* (last edited 8 months ago) (1 children)

is this really a feature not built into Java Script?

x % 2 == 0

[–] [email protected] 2 points 8 months ago (1 children)
(+x) % 2 == 0

If you forget for a second it's Javascript, the language will turn back and bite you.

[–] [email protected] 1 points 8 months ago (3 children)

I am not good friends with js, what did I miss?

[–] [email protected] 1 points 8 months ago (1 children)

JS is a language where [1,2,11].sort() returns [1,11,2].

And if you use a variable instead of a bare array, half the functions are side-effectful, as determined by coin toss.

And if you try declaring that variable with new Array(3).map() then it will ignore all 3 indices, because undefined is real enough to be enumerated, but not real enough to be iterated, because, and I cannot overstress the importance of this principle in Javascript, go fuck yourself. Go fuck yourself is why.

[–] [email protected] 1 points 8 months ago (2 children)

Array(3) doesn't create [undefined, undefined, undefined, ]; it creates [/* hole */, /* hole */, /* hole */, ]. The holes don't set any property on the array whatsoever, so they are skipped when iterating. How this makes sense, I can't tell you.

[–] [email protected] 1 points 8 months ago

Yet the array contains exactly three nothings.

It's like a zen koan.

[–] [email protected] 1 points 8 months ago

Time is a flat circle

[–] [email protected] 1 points 8 months ago

This evaluates to NaN for some reason:

'10' % 0

Since JS doesn't really differentiate strings from numbers, except on the places it does, it makes sense to make sure you are working with numbers.

[–] [email protected] 1 points 8 months ago

Not a JS dev either but ===.

Not really sure what the (+x) is about