What's the benefits of using R.curry vs manually currying function using ES6 arrow function ?
@jgoux R.curried functions can be called in different ways
R.curry((a, b, c) => {}) vs a => b => c => {}
Functions curried Ramda-style are more versatile.
eg
f(a,b,c)
or
f(a,b)(c)
f(a)(b)
f(a, b)
f(_, b)(a)
Is there any downside of using R.curry if I want to use sanctuary ?
I don't think so. What is your concern?
I was just curious, I know that sanctuary enforces more rules than ramda no ?
so I wanted to know about the currying ^^
let's go for R.curry \o/
Sanctuary is stricter, that's true.
There are a few Sanctuary functions which require a curried function.
I'm using Future btw, it's so much better than Promise
But functions curried Ramda-style are at once curried and uncurried. ;)
@Avaq did a great work with
fluture ! :clap:
That's great to hear! Promise is flawed.
I tried the reader monad but I found it comes with more downsides than benefits when you want to use multiple monads
@jgoux fwiw, personally I almost always prefer multi-step arrow functions
@kwijibo My issue with multi-step arrow function is that I can't use
R.__ to easily adapt my partial applications
unless exposing an API where you can't predict what the most useful way of applying arguments will be
that's true
I mostly find I know how the arguments will be applied (within my own code), and find it clearer to have one way to do it
@davidchambers Nice, I didn't know about this one:
f(_, b)(a)
@Risto-Stevcev this is placeholder)
@Risto-Stevcev http://ramdajs.com/0.20.1/docs/#__
Oh, nvm, lol
I must be getting tired or something, didn't realize its just
R.__
^^
Does anyone use monad transformers in JS ?
I'd like to use Maybe and Either, but as I also use Future, the code becomes quickly noisy x)
You mean like this one: https://github.com/Avaq/Fluture#value--future-a-b--b---void---void
It's basically the same functionality as my LazyEither "Future" lib, though I have to admit I like it quite a bit more than mine
it's more flexible
yes I use fluture and I really like it
yeah he did a good job on it
Also, how would you represent Haskell let...in or expression...where notation in JS ? Nested functions ?
es6 has
let, you wouldn't need the in part because the let is bound for the remainder of that block
there's no equivalent to
where notation
though you could use
const actually for where
because
const is variable hoisted
I like the
where notation the most :(
I assume I can do it using
var ?
Neither
const nor let are hoisted as far as I know
const is hoisted
@Risto-Stevcev I don't think
http://goo.gl/QNal52
const is hoisted in a way that would allow for where. The definition is hoisted but assignment is not.http://goo.gl/QNal52
@Bradcomp yes
const was hoisted in older versions of the V8 but not anymore i think.
@Bradcomp Yeah, you're right
I don't think variable assignments were ever hoisted in javascript
only variable definitions
That's right
@jgoux I guess you would have to resort to closures or making a small function wrapper
You could probably use generators to achieve what you want
generators ?
interesting
simplest example : http://goo.gl/epSE1f
how would you put the steps after the program ?
we can't use a
function if we want to use R.curry
What's the benefits of using R.curry vs manually currying function using ES6 arrow function ?
Just wanted to jump in and say there are benfits to sticking with arrow functions. Debugging, less indirection, type inference. (probably) performance.
I'd love a ramda build that was just arrow functions.
As infeasible as that may be
I think I'd like arrow function by default, and a function to transform it to use the
R.__ somehow
so in 90% of the cases you can use the arrow function approach, and when you need flexibility you use a function to transform it
for the
expression...where I don't see how to do it without using var
I'm really not a fan of placeholders, but I guess, the arrow function approach breaks things like
flip
@jgoux You would
yield them, but in all honesty considering how JS binds this, you're probably better off using arrows
but you could have a flip that worked
const flip = (fn) => (a) => (b) => fn(b)(a)
@ram-bot
((a, b) => console.log(a + b))(2, 5)
ReferenceError: console is not defined
@ram-bot
((a, b) => a * b)(2, 5)
10where would just be calling the function with (2, 5)
@jgoux Or you could do something like this:
const def = fn => ({
where: obj => (function(obj) {
Object.keys(obj).forEach(key => this[key] = obj[key])
fn()
})(obj)
})
def(() => {
console.log(a + b)
}).where({ a: 2, b: 5 })
do we have something along those lines R.isFalse(value)
@6ewis
R.when
@Risto-Stevcev what I was looking for was isNil
gotcha
what am I doing wrong here?http://goo.gl/KBeRlo
updateEntityType expects the only param to be a string, while map will pass whole object
also, for your purposes
R.evolve seems to fit better
@prontiol it is a string. did i copy the wrong version of the link
hmm
ah okay
take a look at my version:
http://goo.gl/6u21qi
http://goo.gl/6u21qi
@prontiol right way to go but id like to know what im doing wrong
@prontiol thanks
okay, gimme a sec to find out
you're missing the third parameter in
R.assoc call
@6ewis Here:
let updateEntityType = (entity) => R.assoc('entity_type', serializeEntityType(entity));R.assoc takes 3 parameters: the field, the value, and the object. the updateEntityType function is only passing it 2 values.
It should look like this:
let updateEntityType = (entity) => R.assoc('entity_type', serializeEntityType(entity), entity);Once I did that the code worked.
that's right
@Bradcomp I thought it was going to curry by default
@6ewis R.assoc will curry by default, but you are using it inside the
updateEntityType function. That function takes a single parameter, entity, and returns the curried function.
@6ewis You can see in your results that you get an array of functions, these are the curried
R.assocs that you are returning from updateEntityType
@Bradcomp I see, thanks
@Bradcomp: "I don't think variable assignments were ever hoisted in javascript only variable definitions". Arguably, function declarations are a form of hoisted assignment.
@CrossEye You got me there. That doesn't really help in the context of mimicking
where syntax though
Not at all. Just an interesting point, as I try to read several hours worth of Gitter while dodging traffic (on foot), Maybe bit a good idea. :smile:
Maybe NOT a good idea.
:)
is there a shortcute for R.evolve to chanve multiple keys at once with the same function?
key values
it works this way by default
like 30
I intend to have multiple properties where i wanna transform 'null' to null
Also did i use R.curry appropriately or theres a better way
you don't need
R.curry there
ok so it just invoke the function and pass the parameter right away
is there a more simple way to express
let scopeName,
variableName;
for (scopeName of Object.keys(commentsData)){
if (!D.vr[scopeName]) {
D.vr[scopeName] = {};
}
for (variableName of Object.keys(commentsData[scopeName])){
D.vr[scopeName][variableName] = commentsData[scopeName][variableName];
}
}
@6ewis you have to provide a transformation function for each key in the first parameter you pass to
R.evolve
@prontiol you didnt change anything
thats exactly what i add without the curry
commentsData look like this
let commentsData = { //intial
comment1: {
text: "I am the first to comment, well written! Bravo!",
date: "In the year 2016"
},
comment2: {
text: "I really appreciate your work",
date: "yesterday"
}
};
i changed
serializeNullValue implementation
@GrosSacASac : you could use R.map and R.evolve?
@prontiol for what purpose? you just removed the return key
it's shorter
I removed
R.curry, you don't need it
@prontiol i understood that part
so what's the problem then?
@prontiol that wasn't my main question
thanks though
@6ewis Are you wanting to run
serializeNullValue over all the keys?
@6ewis http://goo.gl/P7xrDa
Map can work on an object as well as an array
@GrosSacASac: on my mobile so I can't test anything now, but does this do anything more than
D.vr = R.merge(D.vr, commentsData)?
@GrosSacASac or potentially
R.mergeWith if there are already comments in D.vr