curry | 易学教程

lodash curry does not work on function returned by flow; lodash FP enough for FP?

阅读更多关于 lodash curry does not work on function returned by flow; lodash FP enough for FP?

问题 Is the lodash flow function a real compose function, or is it something that looks like one, but is optimized to run fast and sacrifices the flexibility I'd expect? I expected flow to return a function I could curry, but instead it gave back a function that uses Javascript's arguments keyword. So curry can't tell that there are pending arguments, and it just gets invoked immediately. Working intuitively enough: var add = function(x, y) { return x + y }; var exclam = function(x) { return x

Why is the non-deterministic choice function in Curry's std lib not defined straightforwardly but rather with a helper 2-argument function?

阅读更多关于 Why is the non-deterministic choice function in Curry's std lib not defined straightforwardly but rather with a helper 2-argument function?

问题 Consider a function choose in Curry programming language with the specification that " (choose xs) non-deterministically chooses one element from the list xs ". I'd implement it straighforwardly through two alternative non-deterministic rules: choose :: [a] -> a choose x:_ = x choose _:xs = choose xs But in /usr/lib/curry-0.9.11/Success.curry from Muenster Curry Compiler, it is defined with a helper function: choose (x:xs) = choosep x xs where choosep x [] = x choosep x (_:_) = x choosep _ (x

Most useful and instructive functional-logic language to learn

阅读更多关于 Most useful and instructive functional-logic language to learn

问题 I was pretty amazed by the power of Prolog. It took some time to get the head around, but to me it seemed to be the coolest declarative language out there. That's why recently, after two years of some functional programming with Scala, I decided to take a look at logical programming again, to "train my brain" or better for actual usage. Combining functional and logical programming seems attractive for me to learn/solidify concepts of both declarative paradigms. I find also find strong type

“foop”: a naming convention? It's a helper recursive function for “foo”; what does the suffix “p” mean?

阅读更多关于 “foop”: a naming convention? It's a helper recursive function for “foo”; what does the suffix “p” mean?

问题 I've come across the following code snippet (a function definition): choose (x:xs) = choosep x xs where choosep x [] = x choosep x (_:_) = x choosep _ (x:xs) = choosep x xs in Curry programming language in a "standard library"--/usr/lib/curry-0.9.11/Success.curry from Muenster Curry Compiler. Here: choose :: [a] -> a and choosep :: a -> [a] -> a -- BTW, not a _p_redicate Is the "p" suffix for the helper recursive function choosep a known naming convention? Perhaps it comes from functional

“readline” (or “haskeline”) for Curry?

阅读更多关于 “readline” (or “haskeline”) for Curry?

问题 What's the most practical way to write a program in Curry programming language that would have a console UI with decent line editing? Actually, I need to pass a string as a suggestion for the user's input, then let the user edit it in the console, and receive his edited variant back, process it (w.r.t. to the current state of the process), then loop. I like readline-like/haskeline-like editing. (And BTW haskeline in its latest version (0.6.4.0) has exactly the API for what I want: read a line

Why is the non-deterministic choice function in Curry's std lib not defined straightforwardly but rather with a helper 2-argument function?

阅读更多关于 Why is the non-deterministic choice function in Curry's std lib not defined straightforwardly but rather with a helper 2-argument function?

Consider a function choose in Curry programming language with the specification that " (choose xs) non-deterministically chooses one element from the list xs ". I'd implement it straighforwardly through two alternative non-deterministic rules: choose :: [a] -> a choose x:_ = x choose _:xs = choose xs But in /usr/lib/curry-0.9.11/Success.curry from Muenster Curry Compiler , it is defined with a helper function: choose (x:xs) = choosep x xs where choosep x [] = x choosep x (_:_) = x choosep _ (x:xs) = choosep x xs What could be the advantages (if any) of the definition from the compiler supplied

Most useful and instructive functional-logic language to learn

阅读更多关于 Most useful and instructive functional-logic language to learn

I was pretty amazed by the power of Prolog. It took some time to get the head around, but to me it seemed to be the coolest declarative language out there. That's why recently, after two years of some functional programming with Scala, I decided to take a look at logical programming again, to "train my brain" or better for actual usage. Combining functional and logical programming seems attractive for me to learn/solidify concepts of both declarative paradigms. I find also find strong type systems very useful and fascinating. Scala really shined with interop. Let's not reinvent wheels. It

Currying in javascript for function with n parameters

阅读更多关于 Currying in javascript for function with n parameters

问题 If f :: (a, b) -> c, we can define curry(f) as below: curry(f) :: ((a, b) -> c) -> a -> b -> c const curry = f => a => b => f(a, b); const sum = curry((num1, num2) => num1 + num2); console.log(sum(2)(3)); //5 How do we implement generic curry function that takes a function with n parameters? 回答1: If I understand correctly, I think this is the way to go using ES6: const curry = f => { const nargs = f.length; const vargs = []; const curried = (...args) => vargs.push(...args) >= nargs ? f(..