Takes a function with arity one and an argument, calls that function with the argument and returns the function return value.

Useful for concisely calling functions returned as a part of a pipeline.

Example

let doubler = fn() {
  fn(x: Int) { x * 2 }
}

doubler() |> apply1(2)
// -> 4

Takes a function with arity two and two arguments, calls that function with the arguments and returns the function return value.

See apply1 for more details.

Takes a function with arity three and three arguments, calls that function with the arguments and returns the function return value.

See apply1 for more details.

Takes two functions and chains them together to form one function that takes the input from the first and returns the output of the second.

Takes a single argument and returns a new function that ignores its argument and always returns the input value.

Takes a function with 2 arguments (an arity of 2), and returns the curried equivalent.

fn(a, b) -> c becomes fn(a) -> fn(b) -> c.

Examples

Currying creates a new function that is identical to the given function except that arguments must now be supplied one by one over several function calls. It thus is the process of taking a function with n arguments and producing a sequence of n single-argument functions. Given:

fn my_fun(i: Int, s: String) -> String { ... }

…calling curry2(my_fun) would return the curried equivalent, like so:

curry2(my_fun)
// fn(Int) -> fn(String) -> String

Currying is useful when you want to partially apply a function with some arguments and then pass it somewhere else, for example:

import gleam/list
let multiply = curry2(fn(x, y) { x * y })
list.map([1, 2, 3], multiply(2))
// -> [2, 4, 6]

Takes a function with 3 arguments (an arity of 3), and returns the curried equivalent.

fn(a, b, c) -> d becomes fn(a) -> fn(b) -> fn(c) -> d.

See curry2 for a detailed explanation.

Takes a function with 4 arguments (an arity of 4), and returns the curried equivalent.

fn(a, b, c, d) -> e becomes fn(a) -> fn(b) -> fn(c) -> fn(d) -> e.

See curry2 for a detailed explanation.

Takes a function with 5 arguments (an arity of 5), and returns the curried equivalent.

fn(a, b, c, d, e) -> f becomes fn(a) -> fn(b) -> fn(c) -> fn(d) -> fn(e) -> f.

See curry2 for a detailed explanation.

Takes a function with 6 arguments (an arity of 6), and returns the curried equivalent.

fn(a, b, c, d, e, f) -> g becomes fn(a) -> fn(b) -> fn(c) -> fn(d) -> fn(e) -> fn(f) -> g.

See curry2 for a detailed explanation.

Takes a function that takes two arguments and returns a new function that takes the same two arguments, but in reverse order.

Takes a single argument and always returns its input value.

Takes an argument and a single function, calls that function with that argument and returns that argument instead of the function return value. Useful for running synchronous side effects in a pipeline.