NodeBB

@fristi the worst implementation you've ever seen

"I want my code to run fast, so I pick the fastest language runtime for my code", says the dev who does not know the ways of the tao.

Behold, their JS code:

// remove items equal to "item" in array "arr"
function removeItem(arr, item) {
   let idx = arr.indexOf(item);
   if (idx < 0) return arr;
   let newArr = [];
   for (let i = 0; i < arr.length; i++) {
      if (i !== idx) newArr.push(arr[i]);
   }
   // isn't recursion great?
   return removeItem(newArr, item);
}

(this example isn't realistic because This Type Of Guy typically uses TypeScript with any all over, but I was too lazy to do that)

explanations of "map" be like
oh so you do a map +1 on a list and it does a +1 to everything on the list

how map actually works:

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@fristi@56k.dile-up.nl null isn’t an integer, and neither is false! How can you differentiate between false/null-that-is-there-on-purpose and the coincidental “not found” null? This lets you do that
In fact, procedural languages tend to emulate this, think about the typescript ?. for example, or the C# Nullable (both of which are kind of nerfed functors)

What FP is good about is about making the flow of the program closely correspond to the way you think / would explain the flow

For example, you could do something like this:

makePrimes x = x
  # (2^x)-1 is likely-ish to be prime
  |> map(pow(2)) # raise 2^x
  |> map(-1) # -1
  |> filter(prime?)

In a procedural language you would need to have a much bigger comment block at the top that explains the approach, and then hope that it stays up to date over time.
In an OO language you kind of just lose track of “how you even get to the right answer”.
In FP if done right it’s self evident and present there, and you can immediately skip to thinking about the thing you’re actually trying to do and potential improvements to the algorithm, rather than fighting with the language to get the result at all

@Johann150 (thank you though, it's slightly nicer than going through and_then)

@Johann150 I'm just not happy that a basic operation (monadic lifting) requires going through "bonus steps", essentially

@Johann150@genau.qwertqwefsday.eu I have an Option<a> and I want to call a fn(a) -> b on it.
If the Option<a> is None, the result should be none.
The operation of taking an fn(a) and making it work on an Option<a> is called a "monadic lift", and it's the whole purpose of having this kind of "wrapper type" to begin with, it's meant to be one of the most basic operations.
What I'm having to do is a .and_then with an extra wrapper lambda which actually returns an Option anyway (rendering the point of it kind of moot)

@Johann150 they literally are monads! just… poorly implemented ones

tried to touch a #rust codebase again
no idea why I did that
what do you mean Option and Result and so on are monads but you can't just lift functions?
then why are they monads??
closest thing you get is `Option.zip_with` but it's Option-only and nightly-only
I'd have thought that moving fast and breaking compat literally every release would mean it wouldn't be literal decades behind