ramda/ramda

Practical functional Javascript

Dave Keen

@ccapndave

false

Ludwig Magnusson

@TheLudd

Well then the function is according to your wishes :)

Denis Stoyanov

@xgrommx

a quiz :smile:

Dave Keen

@ccapndave

What about R.pipe(R.identity(), R.lt(2))(1)

It feels like that should return true

But anyway

I understand why it can't

But its still weird :)

Roman Pominov

@rpominov

just wonder, why this works R.identity()()()()()()(1)?

Ludwig Magnusson

@TheLudd

A curried function called with no arguments returns itself

Roman Pominov

@rpominov

ah, makes sense

Denis Stoyanov

@xgrommx

This project looks promising https://github.com/gonzaloruizdevilla/alicates

David Chase

@davidchase

interesting name translates to pliers ?

Denis Stoyanov

@xgrommx

yes)

Dave Keen

@ccapndave

Is there a function like R.nth, but that takes an array of indexes and returns an array of values?

R.multiNth([0, 2])([1, 2, 3, 4, 5]) => [1, 3]

Kevin Wallace

@kedashoe

@ccapndave R.props can help you there

@maintainers maybe an @see from R.nth to R.props would help?

Dave Keen

@ccapndave

Oh, perfect

Yes a @see would be cool

I have just spent about three hours writing a long complicated Ramda algorithm, only to discover that I can do it in 5 lines

argh

Danielle McLean

@00dani

http://ramdajs.com/0.17/docs/#set and http://ramdajs.com/0.17/docs/#over appear to have exactly the same description and probably shouldn't.

David Chambers

@davidchambers

Thanks, @00Davo. This was fixed in ramda/ramda#1337.

Dave Keen

@ccapndave

Is there a R.mapWithIndex or equivalent function somewhere that I am missing?

Currently I am doing some monstrosity with converge and range

Ludwig Magnusson

@TheLudd

check out addIndex

Dave Keen

@ccapndave

Thanks

That's really higher-order

I like it

Ludwig Magnusson

@TheLudd

Genreal question: What do I need to do to control the text in this view on gihub. I.e where it says "See the upgrade guide for a description of the changes"

David Chambers

@davidchambers

GitHub releases are still mysterious to me. @CrossEye knows his way around them.

Simon Friis Vindum

@paldepind

@TheLudd I think it's controlled by git tags. You make a tag to do a release.

Jakub Korzeniowski

@kujon

just wondering - is lens composition possible in Ramda?

Jakub Korzeniowski

@kujon

just figured out the answer, it is left-to-right for lenses as explained here: ramda/ramda#1288

Ludwig Magnusson

@TheLudd

@paldepind But if you look at the tag messages of ramda, they don't contain that text

Scott Sauyet

@CrossEye

I have simply been editing the tag, including the text and making it as a prerelease. No magic.

Kevin

@kevinwshin

Why does
R.compose(R.map(R.__, [1,2,3]), R.add)(1)
not work? And what is the difference between that and
R.compose(R.map(R.__, [1,2,3]), R.identity)(R.add(1))?

Scott Sauyet

@CrossEye

This would work:

R.compose(R.map(R.__, [1,2,3]))(R.add(1));  //=> [2, 3, 4]

The original is trying to map the binary function add over [1, 2, 3], which doesn't make sense, then assuming the result is a function, and calling it with value 1.

map needs a unary function.

Scott Sauyet

@CrossEye

I'm exaggerating when I say that doesn't make sense. It returns a list of functions, essentially equivalent to [add(1), add(2), add(3)];

R.map(R.flip(R.call)(5), R.map(R.add, [1, 2, 3])); //=> [6, 7, 8]

But I don't think that's the sort of behavior you're looking for.

Kevin

@kevinwshin

I thought compose would give 1 to add, then give add(1) to map. Am I misunderstanding?

Scott Sauyet

@CrossEye

Sorry, I misread. You're right, it should, in my opinion.

I believe we broke compose in v16 or v17. I'm planning on writing up a proposal to reverse that. I was planning on doing it days ago, but life got in the way.

Kevin

@kevinwshin

Oh, good to know. Thanks for taking a look. If it helps, I think pipe is also behaving the same way.

Scott Sauyet

@CrossEye

Yes, it was the same check-in.

We're having lots of discussions right now about compose/pipe, and we need to figure out how to deal with this.

This did work in v15: http://bit.ly/1O0uEki

But it broke in 16.

ramda/ramda#1318 discusses some of the problems.

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