Snap! user discussion

bharvey

Scratch_Mapping wrote:

[break out v] of loop::control cap
[continue with next iteration v] of loop::control cap

In the Tools library are blocks CATCH and THROW.

You can make custom looping blocks that include the two CATCHes, and define custom BREAK and CONTINUE blocks with the two THROWs. Nested loops should work properly too, although if you use the same catchtags then of course you can't break out of multiple levels at once.

Last edited by bharvey (Feb. 16, 2017 04:14:37)

MichaelOlifant

Where's the generator project?

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MichaelOlifant

bharvey wrote:
Chibi-Matoran wrote:
However, the report block is a stack block, and the call block's ring can only accept reporter statements. Aside from making a named custom reporter, how can I use the report block?
It would definitely simplify our lives if every block reported a value, as in Lisp. And, even though you were able to solve your problem by just calling an expression, sometimes you do need to call a multi-step script that ends with a report block. To do so, drag a command-shaped ring from the top of the Operators palette into the existing ring slot in CALL, and it'll replace the reporter-shaped one.

Note: Snap! uses applicative order evaluation, and so technically you can't use the Y combinator itself; you have to use the more complicated applicative-order variant. But for most purposes you can just use
http://imageshack.com/a/img924/5965/T0nFcW.png
which, technically, isn't a combinator at all, but gets the job done.

Jonathan50 wrote:
I thought Y combinator was a company that (donated to? somethinged? invested in? uhh) startups.
The company, which invests in startups, was founded by Paul Graham, who made his fortune by getting software projects running a lot faster than his competitors, because he wrote it in Lisp. See http://www.paulgraham.com/avg.html for example. Anyway, he named the company after the lambda calculus recursion operator.

I have an implementation of this here.

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bharvey

MichaelOlifant wrote:
Where's the generator project?

What generator project?

I have an implementation of this here.

Indeed. Every time I try to reproduce that without looking it up I get a headache. I see why you have to use λf . f several times, but I can't get them properly nested.

MichaelOlifant

bharvey wrote:
MichaelOlifant wrote:
Where's the generator project?
What generator project?
I have an implementation of this here.
Indeed. Every time I try to reproduce that without looking it up I get a headache. I see why you have to use λf . f several times, but I can't get them properly nested.

The one with the yield block.

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bharvey

MichaelOlifant wrote:
The one with the yield block.

I'm sorry, I guess I'm slow tonight, but I still have no idea what you're talking about. Some thread I've already forgotten?

MichaelOlifant

bharvey wrote:
MichaelOlifant wrote:
The one with the yield block.
I'm sorry, I guess I'm slow tonight, but I still have no idea what you're talking about. Some thread I've already forgotten?

What? You posted it yesterday 14:04:14. 2 P.M. isn't nighttime.

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MichaelOlifant

I have a block for JSON objects:

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MichaelOlifant

bharvey wrote:
MichaelOlifant wrote:
Where's the generator project?
What generator project?
I have an implementation of this here.
Indeed. Every time I try to reproduce that without looking it up I get a headache. I see why you have to use λf . f several times, but I can't get them properly nested.

Of course, my version is

where

is the Y combinator-ed variant and the ring is curried.
Equation:
Y = λ f.(λ x.f (x x)) (λ x.f (x x))

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jokebookservice1

MichaelOlifant wrote:
bharvey wrote:
MichaelOlifant wrote:
The one with the yield block.
I'm sorry, I guess I'm slow tonight, but I still have no idea what you're talking about. Some thread I've already forgotten?
What? You posted it yesterday 14:04:14. 2 P.M. isn't nighttime.

Timezones…

bharvey

MichaelOlifant wrote:
What? You posted it yesterday 14:04:14.

I checked through all of yesterday and didn't find a relevant post from myself. I'm so confused.

Are you talking about the thread system in the reference manual?

MichaelOlifant

djdolphin wrote:
MichaelOlifant wrote:
Will we use minecraft forge? or is it compatible for 1.11?
It'll use Forge for Minecraft 1.11. I haven't had much time to work on it unfortunately.

I don't see it in YouTube…

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Scratch_Mapping

How to make this in Snap? Is there a block that does this or do i need to make one?

for ((i)::control) in list [] {
}::control

 :: obsolete
 :: #FFFFFF
 :: pen

gdpr533f604550b2f20900645890

Scratch_Mapping wrote:
How to make this in Snap? Is there a block that does this or do i need to make one?
for ((i)::control) in list [] {
}::control

If you select File, then Import tools, you will find a list block called

for each ((item)::list) of [list input] {

}::list

.

MichaelOlifant

nathalierun wrote:
Hello,

Here is a summary of a project.
http://nathalierun.net/depotLibre/milieuDyn0.html
I don't understand why I am obliged to put a bloc “Forevor” on sprites A and B to make my project turn correctly.

The time reactivity is very slow…

Thank's for some help.

nathalierun wrote:
The project is here
http://nathalierun.net/depotLibre/Milieu.xml

nathalierun wrote:
Woh ! Thank you…

What I'm trying to do is some dynamical geometric project.
Sprite A is a point. Sprite B another point.
Sprite named M is the midpoint of (A,B).

If you move A or B, M must follow.

Like here :
https://scratch.mit.edu/projects/96670059/

I have a workaround here.

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xly

nathalierun wrote:
Woh ! Thank you…

What I'm trying to do is some dynamical geometric project.
Sprite A is a point. Sprite B another point.
Sprite named M is the midpoint of (A,B).

If you move A or B, M must follow.

Like here :
https://scratch.mit.edu/projects/96670059/

Look at this : http://snap.berkeley.edu/snapsource/snap.html#present:Username=xleroy&ProjectName=middle

MichaelOlifant

I have a project that uses the Pythagorean theorem here.

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MichaelOlifant

bharvey wrote:
Of course what Jens should have done in his EVERY example is this:
http://snap.berkeley.edu/keepevery.png

PS Actually I'm not sure why this works, given that the length of the list isn't divisible by 3. Jens?

PPS I mean, why does it work the second time you click it?

The length of the list isn't divisible by 3. So storing the ring in a variable won't work, but using it explicitly works.

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Gabriel2900

The reporter below doesn't report “atchscray”

(join (cascade until (<(list [a] [e] [i] [o] [u] @delInput @addInput:: list) contains (letter (1) of [])> @addInput:: ring grey) ((join (all but first letter of []::operators) (letter (1) of []) @delInput @addInput::operators) @addInput::ring grey) [scratch] ((#)::control)::control) [ay] @delInput @addInput::operators)

21399annie

Hi,

Great program! Currently using Snap for my AP Computer Science Principles exam. One question though, would it be possible to allow us to use text when creating a sprite? It'd make everything much easier since we don't have to write it ourselves / use the say function.

Thank you!

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