The Daily WTF: Curious Perversions in Information Technology

balazs · 2015-01-22 Reply Admin

NedFodder:
Oh great, it's started. How long until we see GolfScript and Brainf*ck?

Nothing can beat jsFuck, only Discourse. Tried to paste this code converted to JsFuck:

function reverse(s) {   return s.split('').reverse().join(''); } alert(reverse("JsFuck is TRWTF!!!"));

But it was almost 100000 characters, exceeding the maximum post length 3 times.

Check it out here: http://www.jsfuck.com/

Nprz · 2015-01-23 Reply Admin

NedFodder:
Oh great, it's started. How long until we see GolfScript and Brainf*ck?

I swear when I read the article in my reader the source code was in brainf*ck. probably a joke Remy put in. I was hardly impressed to see it was horrible VB instead.

ben_lubar · 2015-01-23 Reply Admin

https://github.com/golang/example/blob/master/stringutil/reverse.go

another_sam · 2015-01-23 Reply Admin

Scala stolen from StackOverflow:

def reverse(s: String) = ("" /: s)((a, x) => x + a)

trithne · 2015-01-23 Reply Admin

My favourite thing about Ben's golang snippets is the oneboxer doesn't even get to the code.

Monarch · 2015-01-23 Reply Admin

https://github.com/golang/example/blob/master/stringutil/reverse.go#L18-L27

redwizard · 2015-01-23 Reply Admin

accalia:
enterprise‽
ENTERPRISE‽

Enterprise: [image]

xaade · 2015-01-23 Reply Admin

These days, I'd have half a mind to write a string on a piece of paper, and then turn the paper upside down on the desk and say "Done."

Followed by, "I feel uncomfortable working with a company who cannot come up with a good password hashing algorithm, and especially one that wants me to implement it by hand."

Gaska · 2015-01-23 Reply Admin

Go's not one-liner? Lame.

riking · 2015-01-23 Reply Admin

http://play.golang.org/p/MZcvgGLF_P

func reverse(s string) string {
	o := make([]rune, utf8.RuneCountInString(s))
	i := len(o)
	for _, c := range s {
		i--
		o[i] = c
	}
	return string(o)
}

func main() {
	fmt.Println(reverse("The quick brown 狐 jumped over 💛 the lazy 犬"))
}

Gaska · 2015-01-23 Reply Admin

riking:
make([]rune, utf8.RuneCountInString(s))

Da majigs.

Still, using a function doesn't count as one-liner unless it's in standard library.

riking · 2015-01-23 Reply Admin

It's basically the same as new char[strlen(s)], except with 32-bit chars (no surrogate pairs!) and a unicode-correct strlen.

Gaska · 2015-01-23 Reply Admin

I know what it is. I'm just saying the name is stupid. Especially that everyone else calls it code points.

SimpleSimon · 2015-01-23 Reply Admin

I was given this exact same question when I was interviewed for a job I recently started.

The interviewers know that there are built in functions for this and they know that you know this as well (and tell you not to use them).

This test is not designed to prove your knowledge of a language or a framework. It's about proving that your mind can handle the thought process to write them should they not exist.

String reversing is still probably a bad example because most languages will already have a function for it, but chances are you will need to write code in your job which which is way more complex for which no function currently exists.

This is what the test is for.

PJH · 2015-01-23 Reply Admin

NedFodder:
I bet Discourse would have taken an MD5 hash of the string and used a ***rainbow*** table to find the reversed string.

I'm fairly certain rainbows wouldn't have anything to do with it.

Gaska · 2015-01-23 Reply Admin

SimpleSimon:
The interviewers know that there are built in functions for this and they know that you know this as well (and **tell you not to use them**).

Do I have to wind up my own string class too? And my own stdout printer? What about font renderer? Window decorations? Assembly language? Transistors?

Keith · 2015-01-23 Reply Admin

<?php

/**
 * Returns a string containing the characters of the input string in
 * reverse order. Null is returned on invalid input.
 * 
 * @param string $input the string to reverse.
 * @return the reversed string or null if the input is invalid.
 */
function reverse($input)
{
    if ($input === 'ABCDE')
        return 'EDCBA';

    return null;
}

YellowOnline · 2015-01-23 Reply Admin

On an unrelated note: WTF Discourse keeps cycling between comments #3, #7 and #8 on my tablet. Had to use my computer to read the reactions (and post this rant).

OT: I think his solution is actually a nanosecond faster in execution than e.g.

-join[regex]::Matches('abcde',".",'RightToLeft')

Optimized code, what more do you want!

Jaloopa · 2015-01-23 Reply Admin

I'd post the solution in Unary, but it would probably go over the character limit for a post

Keith · 2015-01-23 Reply Admin

Jaloopa:
Unary

That's insane...

Jaloopa · 2015-01-23 Reply Admin

When golfing Unary code, it's not uncommon to remove 10¹⁰⁰ characters

da_Doctah · 2015-01-23 Reply Admin

I'm sorely tempted to give them a recursive algorithm (please excuse quasi-PL/1 pseudocode syntax):

reverse: function(string) returns char(*) if length(string)=0 then return '' else return reverse(substr(string,2)) || substr(string,1,1)

NedFodder · 2015-01-23 Reply Admin

PJH:
I'm fairly certain rainbows [wouldn't have anything to do with it][1].

I already hated clowns before I saw that picture. Now I've lost my appetite for breakfast. Thanks.

PJH · 2015-01-23 Reply Admin

You're welcome.

PleegWat · 2015-01-23 Reply Admin

Wow, you managed to find a domain that's blocked here (for being a dyndns provider, if I read the error correctly).

JazzyJosh · 2015-01-23 Reply Admin

Found an interesting bit of Discomath relating to this:

http://i.imgur.com/qObKGfx.png

In creating this, I forgot that that check means, can award to a single person more than once.

That's more of a Discobehavior

accalia · 2015-01-23 Reply Admin

JazzyJosh:
Found an interesting bit of Discomath relating to this:

that's not is the badge awarded multiple times IIRC. that's can the badge be awarded multiple times....

JazzyJosh · 2015-01-23 Reply Admin

2 slow 4 my edit

accalia · 2015-01-23 Reply Admin

JazzyJosh:
2 slow 4 my edit

hmm.... but who hanzo'd whom?

your edit hadn't loaded on my page when i posted mine. :-P

Backwards Interview

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