Lua is terrible. Don't use it.

For those of you demanding a reason Lua is shit,
consider the following code:


local fh = io.open(filename, "r")  
while true do
    line = fh:read("*l")
    if line == nil then break end
    f(line)
end

That is a fucking eyesore. The whole point of a while loop is to embed the exit condition in it. When you have to make an infinite loop and then use an if statement with a break to accomplish what you can normally do with something like:


fh = fopen(filename, "r");  
while(fgets(line, max, fh) != NULL) {
    f(line);
}

that's when you need to stop using that language. Also why do if statements have "then"s? Any programming language that uses "then" is awful.

hello, ``pythonista!''

I use infinite while loops with a break statement all the time, regardless of language. Saves me creating/setting a variable.

``Problem'', >>1-san?

That is your main problem with Lua? How about that all vars are global by default?

GC is shit

how about the fact that it is SLOW AS FUCK compared to python

>>6
IHBT

> require "antigravity"
stdin:1: module 'antigravity' not found

fuck this shit, where's my xkcd reference

Not being able do something like

while(var = f(x)) {
  /* WHY CAN'T LUA DO THIS? */
}
IS A HUGE PROBLEM. You can't do it in for or if statements either. It just ends up looking way more cluttered and ugly.

Lua implements proper tail calls (or proper tail recursion)
NOPE. NOPE. NOPE. NOPE. NOPE.

WHY DOESNT ANYBODY LISTEN TO GVR

>>10
Because he's talking about Python not Lua.

You can use the

file:lines()

method to get an iterator that will return the lines in a file. So the code in the op can be written as:


local fh = io.open(filename, "r")
if fh == nil then
  error("I couldn't open "..filename.." for reading bro\n")
end
for line in fh:lines() do
  f(line)
end

And if you want to make a superduperawesome iterator utility library, you can make it more compact and unreadibly functionaly:


function iter_lib.foreach(iter, fn)
  for value in iter do
    fn(value)
  end
end

function iter_lib.mask(iter, fn)
  return function()
    local value = iter()
    if value == nil then return nil end
    return fn(value)
  end
end


iter_lib.foreach(iter_lib.mask(io.open(filename, "r"):lines(), f))

>>12

wupsydaisy. The foreach function should have beeenn:


function iter_lib.foreach(iter)
  for _ in iter do
  end
end

but that is not that great...

or the executing line could have just beeeen:


iter_lib.foreach(io.open(filename, "r"):lines(), f)

>>12
Memory intensive

>>14

Using the iterator does not necessarily load the entire file into memory at once. file:lines() returns a function, which you can call repeatedly, and every time you call it, it will return one line from the file. When there are no more lines to read, the function will return nil. A reasonable implementation of file:lines() would return a closure that line buffers the file.

Lua does have the extra overhead of interning the read string into a string table though, which would make the process or reading in a file a tad slower than normal.

nah you're just terrible.

>>12 is right, just use iterators or HOF or whatever.

However, >>1 is right but for other reasons. Something I can't stand is the general "string-oriented programming". In Lua, you have the "typeof" function that returns the type of the thing as a string. One might say it is a very minor issue, but one find that again in third party libraries, with worse consequences. For instance:


frame.fgcolor = "255 0 0"
frame.size    = EIGHTHxEIGHTH
frame.title   = "This is the frame"
frame.margin  = "10x10"

This is taken from frame.wlua, an exemple file for the iup library. Geometries and colors are passed as strings?
Unfogivable

>>17

Yeah, the typeof thing is a little clunky, but because strings are always unique, string equality can be resolved via pointer/object-id/whatever, making it just as efficient as returning an integer type id.

That is a horrendous library though. Why did they do that? So if you wanted to parameterize the foreground color, you would have to do:


frame.fgcolor = string.format("%d %d %d", r, g, b)

What the why.

enjoy your impure imperative AIDS.

Something that really pisses me off is that Mike Pall put so much effort into making an extremely efficient JITC interpreter for Lua instead of a decent language.

Hello fucking faggots, how about this?

map(f, file(filename))

-- signed - Guido van Rossum

!= NULL

ishyddygit

>>21
It returns a ``map object'', which isn't a proper replacement for a lazy list, if that was the intention, as you can't even get an element from that crap without using a for-loop. Which is probably the whole principle of the thing, making GvR feel like he is sticking it those treacherous functional programmers who tricked him into putting lambda in his language.

>>22
What would you do? Also, /sp/ memes, really?

>who tricked him into putting lambda in his language
Who exactly?

>>25
About 12 years ago, Python aquired lambda, reduce(), filter() and map(), courtesy of (I believe) a Lisp hacker who missed them and submitted working patches. But, despite of the PR value, I think these features should be cut from Python 3000.

http://www.artima.com/weblogs/viewpost.jsp?thread=98196

>>26
b = map(lambda x:f(x)+1, a)[code]
vs
[code]b = [f(x)+1 for x in a]

The only reason why the latter is shorter is because there's no shorthand for writing anonymous functions, such as -> x {f(x)+1}, or even ->{f(\x)+1}. But noooo, that's not going to happen, since Fucktard von Ransom thinks lambda is evil. Too much syntactic sugar makes your teeth rot. Ever thought about that?

>>27
Your BBCode is buggy.

I do think Guido van Rossum is a scumbag and a fool.

PENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRTPENIS GOES IN ASS CRACK WHORES SHIT FACE FUCK HEADED ASS CUNT COCK SUCKING SLUTS PEEING ON THE TV WATCH A GROWN MAN SHIT ON A CACTIS WHILE EATING GRAPE FUCKING ASSWHORE SHIT ON MY TELEVISION I PEE ON BRICKS FUCKING CUNT SHIT PAKI JEW NIGGER SLUT I CAN'T FUCKING STOP SHITTING ON THE PATIO WHILE SMOKING A CAT ALARM BURGLAR BURGER LETTUCE TOMATO SITTING IN MY TOILET FERMENTED IN FRESH SHIT I CANT FUCKING BELIEVE IM NOT SPREADING BUTTER ON A WHALE'S ANUS FUCKFACE SHIT BIRD PEEING ON THE FENCE WHILE I JACK OFF IN A MOUND OF DIRT

>>24
W H Y jolly picshur graffix

i wish the programming world would just del Lua and move onto better things like python

>>29
youre amazing post, and my personal experiences have convinced me.
also >>31 lua isn't a programming language contrary to popular belief it is a syntactical paradigm _{like html}

>>31
You kids don't have a clue, do you?  Lua is a great language for embedded scripting, and Python is just Perl's prettier, dumber sister.

JACKSON 34 GET

COOL ^FREE RINGTONES AT http://www.lua.org/

>>35
Who would give away free ringtones? How would they earn back the money‽
Next you'll tell me they have wallpapers as well! But you're not fooling me!

ruby master race

>>36
http://torrentz.eu/search?f=wallpaper

>>33
But Perl is better for embedded scripting, so what does Lua actually excel at?

>>33
Prettier? She's 20 years old dude—her baby fat is no longer considered 'cute'.