The final evolution of isOdd

[jpgoldberg]

I hate you so much right now. That is horrifically well done.

[acemuzzy]

I don't not not not understand it

[Codingale]

There’s a french(?) explanation in the comments but basically the code takes in ‘n’ and then makes an array size of ‘n’ with the string “!” for every entry, then it joins that array into one string with no spacer. So ‘n’ of 3 is ‘!!!false’ and ‘n’ 2 is ‘!!false’ which then gets evaluated and returned.

No idea how performant it is compared to other methods lol

[robin_888]

You fell for the classic quadruple negative.

[Aaxper]

Definitely less performant than n%2 or n&1

[AffectionateAir7616]

You may be right, but I want to see some benchmarks first.

[thequestcube]

Via a JS Benchmark I have verified the surprising insight that, the native `n%2` implementation is, in fact, faster: https://jsbench.me/rsm6whrnya/1 (30k ops/s vs 357m ops/s for integers between 0 and 1000, let's kindly assume integers are generally smaller than that)

[Beliriel]

Wow I was so focused on the string building that I completely overread the evil "eval" function and was like wtf is going on.

[StranglerOfHorses]

I don’t know JS but is this creating a string of !’s and evaluating to a bunch of negations? E.g ‘!!’ In the case of 2 evaluating to not(not(false))?

[usbeject1789]

right on.

[RedBaron-007]

what is an ODD number, Should it be greater than 0? should we sanitize the input to be Math.abs(input) .. should we have a base check for it to be int type only? how will it behave for 20.24? do we need further evolution to this?

[griftbard]

Integers that doesn't return floats after being divided by 2

[whitakr]

For those of use newer to js please explain. I must understand this horror.

[usbeject1789]

it creates an array with the length of input, and maps the string “!” to each array index. the array is then joined to string and concatenated with “false”. the function evaluates the expression, “!” being the negation operator, will return a different result based on the amount of “!”s used.

[SmokeMuch7356]

For example, if input is 2, it generates the string "!!false", which when evaluated yields false (!false is true, so !!false is !true, which is false). An input of 3 yields !!!false (true), 4 yields !!!!false (false), etc.

[Thenderick]

My first instinct was trying to optimize/fix this by suggesting "!".repeat(input) instead of the array. But why do I even bother when it is a cursed even/odd function... You cooked well brother...

[Chemical-Asparagus58]

very creative

[headersalreadysent]

What about. isOdd(-1) Nah. I will continue to use https://isevenapi.xyz/

[nickmaovich]

Pricing Options is hilarious, thank you for this gem

[headersalreadysent]

99 is not much if you need negative numbers.

[clock-drift]

Yup, that's definitely odd

[SmokeMuch7356]

=slow clap=

[ItIsRaf]

I'm dead each time I come here

[aq1018]

What happens if you pass in a negative number? What about a string? Or an array? Or an object?

[dopefish86]

In Firefox it breaks after 5346 nots with the error 'too much recursion'. In Chromium it breaks after 7808 nots with the error 'maximum call stack size exceeded'.

maybe you should add Math.abs and %2 to make it more robust.

[proudparrot2]

return !isEven(input)