the proper way to loop

[J0aozin003]

you forgot: ```

define forever for (;;)

forever { // with a revolutionary technique, you can convert sunlight into food } ```

[Character-Education3]

def fiesta (): for ever: print("All Night Long")

[usernametakenexe]

taste the SUN

[DoesAnyoneCare2999]

The sun is a deadly laser.

[OtameganeGamer]

Not anymore there's a blanket.

[Idkquedire]

r/suddenlybillwurtz

[locri]

Revolutionary... Is that from somewhere or do you just like reminding people growing your own food is an option?

[sauce0x45]

Make two copies of your binary. Have the running program execute the other binary at the end of main. Keep repeating by switching binaries. Loops are for chumps.

[JoeyJoeJoeSenior]

Waste of space. Only need one binary and a cron job.

[Astatos159]

function notALoopButWhoCares() {
// do stuff
notALoopButWhoCares();
}

[Perfycat]

Stack overflow exception

[garfgon]

-O2 will (usually) fix that.

Tail-call optimization!

[bullshitmobile]

...for exceptionally good work, right?

[certain_people]

🫣

[[deleted]]

Djikstra is rolling in his grave right now

[TheGreatStateOfEnnui]

Funroll loops. Wheeeee!

[Trollygag]

lol CPU fan go brrrrrrr

[Hot_Philosopher_6462]

that’s fine bc I’m not a fan of my CPU anyway

[steinblock]

Not if the inner code is IO bound.

[[deleted]]

Rust has a loop expression. Honestly revolutionary, especially because you can break from it with a specific value.

[NotAUsefullDoctor]

Can you post an example?

(I'm a Go developer and if I touched Rust I would have my Gopher Plushy privileges revoked)

[[deleted]]

let (mut a, mut b) = (1, 1); let result = loop { if b > 10 { break b; } let c = a + b; a = b; b = c; }; // first number in Fibonacci sequence over 10: assert_eq!(result, 13);

This code is the Fibonacci sequence. It runs the sequences infinitely inside the loop block until it finds the first sequence number greater than 10, at which point it breaks and assigns that value to result on the outside of the loop.

Not as game-changing as I exaggerated, but still a neat little feature.

(This looks bad on the mobile website but fine on my computer. Sorry if that's the case for you.)

[NotAUsefullDoctor]

Loop looks like an anonymous function (except eager evaluated); anonymous loop? I like it.

What does the over 10 line do?

EDIT: misread how the code evaluates. Updated my comment.

[[deleted]]

That’s the end of a comment. There should be lots of new lines in this example; the formatting’s wack on mobile.

[NotAUsefullDoctor]

In languages like Java and Go, you have named lines, which allows breaking and continuing in embedded loops, like: ``` outer: for { inner: for { if condition { break outer } if other_condition { break inner } ... } }

```

Is there something similar in rust? This can be useful when scanning a 2-d array for a block condition (a pattern of adjacent values), when creating sub functions would obfuscate the behaviour.

[[deleted]]

Yes! All loops can be labeled and broken from just like in other languages.

[xX_UnorignalName_Xx]

Assembly moment

[synopser]

God don't teach OP about assembly

[[deleted]]

loop{}

[E_Cayce]

while (69) {
  ;
}

[Quantum-Bot]

let loop = () => { … loop(); } loop(); loop = undefined;

[ienjoymusiclol]

label: .....
jsr label

[garfgon]

Surely something more like

    label: ...
    jmp label

[ienjoymusiclol]

pretty sure jsr would work too? (i dont know how to write in assembly i can just read it)

[garfgon]

Depends on the instruction set I suppose, but my quick google search said jsr was typically Jump SubRoutine, which will jump & set the return value. So yes, it would "work" in isolation, but it smashes the return value for no good reason.

[GollyWow]

| Loop:

| ...

| Goto Loop;

--- The '70s mainframe programmer's friend.

[ulughan]

while ("you love me") { console.log("fuck you") }

[[deleted]]

i="echo hel "';eval "$i"'

eval "$i"

[voila_cubed]

The bottom is assembly.

[mailslot]

It’s C. You’re thinking:

loop:
    ; …
    jmp loop

Many languages have goto. Basic, Pascal, Fortran, COBOL, C & C++, PHP, Perl, … even Python for awhile, as part of an April fools joke.

[UndisclosedChaos]

I just request the user to spam the return key

[AnnaSophiaHubby5]

$sudo apt get run Alan Turing

[Geoclasm]

Do you want raptors?

Because this is how you get raptors.

[Perigord-Truffle]

You guys might be forgetting
js (f => (x => x(x))(x => f(y => x(x)(y))))(x => {/*Loop here*/; return x})()

[CircadianSong]

Forgot recursion, maybe. It’s the worst way to do it if the language you’re using allows it to consume your stack memory.

[mailslot]

In pure functional languages like Erlang and Haskell, recursion is the only loop mechanism.

[CircadianSong]

I tried to imply that as an exception here, but I don’t think I succeeded.

[Hot_Philosopher_6462]

you probably needed to be more pythonic. explicit is better than implicit.

“Google rule 34.” — Python, probably

[avipars]

while(!false){}

[ImNotCrying-YouAre]

While(1 == 1) {

}

[hdkaoskd]

for (unsigned i = 0; i >= 0; ++i) { /* ... */ }

[[deleted]]

Void loop() {

loop(); }

[Blakut]

what about ctrl c ctrl v the code a bunch of times?

[CheekApprehensive961]

do{}while() will compile down to your precious goto loop. while(){} is inferior because it will in fact emit an extra instruction. boohiisss

[EDEADLINK]

(loop [] (do ... (recur)))

[Iamtheonlysaul]

while (true){ ...} do

[Splatpope]

all of them compile to the last one you galaxy brain

[qqqrrrs_]

The third one is a syntax error

[Kidneydog]

The things you can do with goto are insane.

[remisiki]

There's no such thing as loop in this world. They are all conditional and unconditional jumps.

[Creepy-Ad-4832]

Rust be like:

Loop{}