Programmer Humor

32561 readers

410 users here now

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

Rules:

Posts must be relevant to programming, programmers, or computer science.
No NSFW content.
Jokes must be in good taste. No hate speech, bigotry, etc.

founded 5 years ago

MODERATORS

cat_programmer@lemmy.ml

AgreeableLandscape@lemmy.ml

719

the hardest exam question (lemmy.ml)

submitted 7 months ago by siriusmart@lemmy.ml to c/programmerhumor@lemmy.ml

145 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] joneskind@lemmy.world 1 points 7 months ago* (last edited 7 months ago) (1 children)

When my console throws a NaN I kinda think of it as an Halloween kid receiving a fruit instead of a candy. They won’t say “That’s a fruit”. They’ll say “That’s not a treat”.

I’m personally pissed more often by a falsy 0.

Did you know that early analog computers would literally explode when asked to divide by 0?

Now computers just say “Hey stupid, that shit is not even a Number in a mathematical sense, but sure I’ll add one to it.” instead of “Why would you kill me like this?”

You can’t really define Infinity as a number, yet it is part of their world.

So typeof NaN === ‘number’ totally makes sense in that regard.

If you ever worked with arrays of dates, don’t judge NaN too harshly.

[–] Skullgrid@lemmy.world 1 points 7 months ago (1 children)

Falsy zero? What's wrong with that, 1 is true and 0 is false. I thought that was standard logic?

[–] joneskind@lemmy.world 1 points 7 months ago (1 children)

in javascript a property is truthy if it exists

myThing.property = "some string"

if (myThing.property) { // true
  // do something
}

It works with everything except of course for falsy values

myThing.number = someNumberThatShouldNotBeEqualToZero

if (myThing.number) {
  // do something very important with that number that should not be equal to zero
}

// This can fail at anytime without warning

So you've got to be extra careful with that logic when you're dealing with numbers.

I am not saying it's wrong though. I'm saying it's often annoying.

[–] Skullgrid@lemmy.world 1 points 7 months ago (1 children)

ah ok , I think I write this a bit more verbose when using other languages, instead of

if(thing)
{
   stuff;
}

I do


if(thing != null)
{
   stuff;
}

so checking for numbers being truthy & existing didn't seem like an issue

[–] joneskind@lemmy.world 1 points 7 months ago* (last edited 7 months ago)

In the case of a non-existing property, the value would be undefined rather than null.

And while == and != exist in JavaScript, most linters will throw an error and require a === and !== instead as they should be avoided.

null == undefined // true
null === undefined // false

Besides, null is a perfectly valid value for a property, just as 0. Working with API Platform, I couldn't tell the number of times I used this kind of statement:

if (property || property === null) {
  // do some stuff
}

Probably just as much as

if (property || property === 0) {
  // do some stuff
}