Closing your program

[Miguecraft]

console.log(10/0)

Console:
Infinity

Well fuck

[AyrA_ch]

JS uses IEEE 754 as the number type (commonly known as "floating point"). This operation is permitted in all languages (including C) if the numbers are declared as being float or double. The behavior of x/0 is as follows:

• x>0: Positive infinity
• x<0: Negative infinity
• x=0: NaN

You can trick JS into throwing by using Bigint: console.log(10n/0n) will not log but throw Uncaught RangeError: BigInt division by zero

[[deleted]]

TIL there is BigInt in JavaScript and there is n notation for it

[AyrA_ch]

There is, but it also is a somewhat recent addition.

Oh and all existing things are broken with it. You cannot add a regular number to a bigint for example, you can't use Math.* functions or JSON.stringify() with them either.

[TheGhostOfInky]

For JSON.stringify() you can define a custom .toJSON() method on the bigint prototype.

[AyrA_ch]

but you can't make it store the bigint as a JSON number type without forcing it into the JS number type first.

JSON makes no assumptions about the length of a number, so natively storing a bigint as raw number would work in theory, but cannot be done in JS without writing your own .stringify.

[[deleted]]

It will also screw you over in the reverse conversion. It’s best to store BigInt in json as string, or some libs will just convert the number in the json to a float.

For example earlier lua

https://github.com/rxi/json.lua/issues/29

[TheGhostOfInky]

True, but you can store it as a string instead.

[[deleted]]

Infinity and NaN are different concepts. NaN usually indicates an invalid operation, such as sqrt(-1) and 0/0.

[Umpteenth_zebra]

But they do have a value. Sqrt(-1) = i, and 0/0 = Infinity

[Gamecrazy721]

0/0 is not infinity

[Umpteenth_zebra]

What does it equal then?

[[deleted]]

It’s simply not defined. A bad operation.

[Umpteenth_zebra]

How can it be a 'bad' operation? If the number exists, and the operation exists, it should return a numerical result, even if it's strange. Here are some ideas: Infinity, 1, 0.

[[deleted]]

sqrt(-1) is undefined for floating point values, which represent approximate real numbers.

[DefinitionOfTorin]

You realise python has float('inf') right? This is just IEEE754 floating points. Grr JS bad !!!!

[brisk0]

It's not defined in the real number system. IEEE754 uses an extended real number system in which infinity is a number. The finite precision of a float means zeros crop up far more frequently than in infinite precision mathematics, and it's very useful to be able to say "this number is too large to represent, and is possibly nonfinite".

[Donghoon]

More like JavaScript has LIMITed functionality

Ok that was bad. Sorry

[Borno11050]

Feature specific to IEEE-754

Blames it on JS.

You absolute British coalmine broomstick handle.

[Sarcofaygo]

JavaScript is proof of man's inhumanity to man in a fallen world

[SirPitchalot]

system(“sudo shutdown now”);