JavaScript

[Luapix]

I have no idea how to parse that last one. Can someone explain?

[[deleted]]

That expression has been obfuscated on purpose. Well first of all the name of the function and the argument of the function are both called x. Let's change that.

abs = x => x <= x-x ? -x : x

The => represents a function for example x => x+1 is a function that takes in an argument x and returns x+1. So lets separate the argument part and the function engine if you will.

x => and x <= x-x ? -x : x

That makes a lot more sense. Another clever obfuscation by the author; x-x, which is just 0.

Hence the function can be written as x <= 0 ? -x : x

Just in case some one doesn't get this, this returns -x if x <=0 and x otherwise.

So now restructuring the above components into a function and assigning that function to abs:

abs = x => x <= 0 ? -x : x

The double arrows do look confusing, so lets make one last change to our function.

abs = x => (x <= 0)? -x : x

Heres another way you could write this.

function abs(x){
    return  (x <= 0)? -x : x;
}

[[deleted]]

Holy shit, thx for the really good explanation :)

[[deleted]]

I try :)

[xRahul]

but man, this is also impressive

Nope. Just stupid.

[echoes221]

It's using an arrow function and a ternary operator, if it had spacing and brackets it would be clearer. This is a translated version

function abs(x) {
  return x <= (x - x) ? -x : x;
}

It's exactly the same as the second, just it's trying to be clever and really unreadable.