Implementing Yield in JS

Conversation started Nov 4, 2013 at 20:53.

John McDonald

Nov 4, 2013 20:53

I made a fiddle demonstrating yield. Maybe someone wants to figure out how to get it to work in Chrome: jsfiddle.net/jcpmcdonald/…

Alex M.

going to install this to track my walking

I walk quite a lot and I'm curious about the distance and stuff

I kinda have this set # of hours I must walk each week; I don't know what that number is, I just "feel" when I walked enough or not enough

hasherr

@AlexM. I have this app, it's quite good.

I use it for both running and walking.

Alex M.

cool

Icy Defiance

@JohnMcDonald your link's all like "screw you, I'm not gonna work"

hasherr

Yeesh, I see that there's been some nastiness in the chat history earlier....

Alex M.

Nov 4, 2013 20:55

to get to my workplace I have to walk on a quite steep road

John McDonald

I made a fiddle demonstrating yield. Maybe someone wants to figure out how to get it to work in Chrome: jsfiddle.net/jcpmcdonald/z4sXk/6

@IcyDefiance My bad

Alex M.

I said to myself if I keep doing it for a whole year I'll become the most fit person in the world lol

Icy Defiance

ah, that wokrs

Alex M.

the first time I got to the top I was like exhausted

hasherr

Haha, Alex.

Alex M.

Nov 4, 2013 20:57

today was easier than usual, but I was still very warmed up

John McDonald

@IcyDefiance should print: 0 1 1 2 3 5 8 13 21 34 in the HTML output

Lasse

@JohnMcDonald is the version needed? remove it?

hasherr

Get some blood moving.

@AlexM. Btw, I am still going to complete my entry game.

Alex M.

that's good

Oliver Schöning

Wise people of GD name my function

hasherr

Nov 4, 2013 20:59

Wanna hear about it?

Icy Defiance

@JohnMcDonald I think it's less an issue with chrome and more with the fiddle itself. I've changed that script tag to something I know works, and it's still ignored

Alex M.

p3nis(params[]) XD

Icy Defiance

I copied the javascript into the javascript box, and then it told me, "document.write is disallowed in JSFiddle envioriment and might break your fiddle." which could be another problem

John McDonald

@IcyDefiance yeah, check the error log: Uncaught SyntaxError: Unexpected identifier

Alex M.

this reminded me of that SO answer

Exception up;
throw up;

Oliver Schöning

Nov 4, 2013 21:00

name ( width, height, widthSegments, heightSegments )
Creates this: http://i1294.photobucket.com/albums/b603/oliverschoening/geometry_zps475276c3.png

MickLH

the Z thing

John McDonald

Updated to console log instead of doc write, and to use the plain old JS version: jsfiddle.net/z4sXk/11

Almo

FanoronaBoardMake( width, height, widthSegments, heightSegments)

Alex M.

makeUglyButSymmetricalStructure(...)

Icy Defiance

@JohnMcDonald yep, that one doesn't work either. does it work in firefox?

Jimmy

Nov 4, 2013 21:01

@JohnMcDonald oops see other room

Almo

not entirely serious, but that is the structure of the Fanarona board.

John McDonald

yes

Almo

time to go

John McDonald

The old one works in FF

Almo

see you guys later :)

Icy Defiance

Nov 4, 2013 21:01

crap, my shift is over. I'm going to relocate, then take another look.

MickLH

sorry for calling it the "Z thing" it's used for memory cache layouts on GPUs

Oliver Schöning

@AlexM. Rude. @Almo Hm.. interesting. Thx

Alex M.

it's not rude

it's not serious

John McDonald

@Jimmy hmm

Oliver Schöning

Took me way to long to figure it out :) But it is gonna pay of ^^

Jimmy

Nov 4, 2013 21:03

it just relies on the fact that closures and coroutines use a similar compiler transform into a state machine

John McDonald

@Jimmy That... just might work. I'll have to think about to re-write stuff

(to others, Jimmy wrote this): jsfiddle.net/talyian/z4sXk/10

Jimmy

because then at least from the call site the usage is pretty much identical

John McDonald

yeah, and in my case, fib() is effectively generated

MickLH

lol that's exactly what I said when the issue very first came up

John McDonald

Is it? I guess I didn't follow

Lasse

Nov 4, 2013 21:07

I've always developed with chrome and never ever even seen the yeild thingie

John McDonald

So, instead of: moveForward(); yield 10;, it would be: moveForward(); return { next: function() { return 10; }} ? I don't think I'm thinking about this quite right

no, not right at all

Jimmy

return { next : function() { moveforward(); return 10; } };

since you want moveforward to be called each time next() is called

next has to contain the entire body of your while loop

unless it is multiple yield statements

in which case you have a mutable next

if you want, post a more complex example and I can translate it

John McDonald

while(true)
{
    scanRight();
    yield 3;
    if(scanResult == BOT)
    {
        turnRight();
        yield 10;
        shoot();
        yield 10;
    }
    else
    {
        moveForward();
        yield 10;
        if(bumped)
        {
            turnRight();
            yield 10;
        }
    }
}

Each command (move, scan, shoot, etc), is associated with a yield statement that indicates the cost of the command (3, and 10 in eg)

hasherr

When you ignore somebody in chat, can they still hear you?

John McDonald

Yes, I can still hear you @hasherr, :p

(I honestly don't know, but probably)

hasherr

Nov 4, 2013 21:14

Thank you, John.

MickLH

Ignoring someone in chat is pretty retarding, you don't have to reply. It's only putting oneself in the dark as to what the conversation is about

hasherr

I asked for a reason, @MickLH ;)

MickLH

I commented for no reason

hasherr

Also, I'd honestly appreciate if you stopped using the word 'retarded' in the room.

MickLH

There you go, "retarding" is more literally accurate

Jimmy

Nov 4, 2013 21:17

@John if you want to do it very similar to how the C# compiler for example creates the yield function

var state = 0;
var next = function() {
    switch(state) {
        case 0:
            scanRight();
            state=1;
            return 3;
        case 1:
            if (scanResult == BOT) {
                turnRight();
                state=2;
                return 10;
            } else {
                moveForward();
                state = 3;
                return 10;
            }
        case 2:
            shoot();
            state = 0; // end while loop
            return 10;
        case 3:

Byte56

@hasherr Feel free to flag anything in chat you find offensive.

hasherr

Well, of course it does have more than one meaning, but i've seen you you use it several times in a more offensive context.

Jimmy

return { next : next };

Dave

@hasherr who have you ignored now ?

hasherr

@Byte56 Thank you.

Dave

Nov 4, 2013 21:18

oh jeese not more drama

hasherr

I'm not going to say who I may have/have not ignored.

Alex M.

PC Gamer
Bugbear's destruction focused FlatOut successor, 'Next Car Game', is now on Kickstarter: http://bit.ly/1aYHTyk

Dave

dont worry i can work it out lol

Alex M.

MickLH

Lol I love how cute it is when little kids are emotionally delusional

Dave

Nov 4, 2013 21:20

thats some weird view of european thats more russian

John McDonald

@Jimmy :/ great... that looks like fun to implement

Alex M.

@Dave yes

Dave

american cars - muscle
european cars - fashion

Jimmy

this is how we did it in the old days. We didn't have fancy shmancy generator expressions and we had to walk uphill both ways in the snow

MickLH

@JohnMcDonald write it in C using setjmp and longjmp and see what emscripten generates you ;)

Conversation ended Nov 4, 2013 at 21:21.

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John McDonald 21%
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Jimmy 13%
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Icy Defiance 6%
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Oliver Schöning 4%
Almo 4%
Lasse 2%
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