Flipping the order of arguments in curried functions with fp-ts

Question

Flipping the order of arguments in curried functions with fp-ts

I've been working with fp-ts and encountered a situation where I have a curried function consisting of two functions, like this:

const newFunction = (name: string) => (greeting: string) => console.log('Hello ' + name + ' ' + greeting);

While this example is simple, there are cases where it would be beneficial for me to reverse the order of the functions, resulting in something like this:

const newFunction = (greeting: string) => (name: string) => console.log('Hello ' + name + ' ' + greeting);

Is there a way within fp-ts to achieve this desired outcome? I came across this article that explains the ap function, but when I tried implementing it in my code, it didn't work as expected.

typescript functional-programming currying fp-ts

Answer 1

Answer №1

If you're looking to switch up the sequence of functions, consider using flow instead of pipe.

For reversing the order of curried functions specifically, give the flip function a try. For example:

import { flip } from "fp-ts/function";

const sayHi = (name: string) => (lastName: string) =>
  `Hello, ${name} ${lastName}`;

console.log(sayHi("John")("Doe")); // Result: Hello, John Doe

const reverseSayHi = flip(sayHi);

console.log(reverseSayHi("Doe")("John")); // Result: Hello, John Doe

Answer 2

If you're looking to switch up the sequence of functions, consider using flow instead of pipe.

For reversing the order of curried functions specifically, give the flip function a try. For example:

import { flip } from "fp-ts/function";

const sayHi = (name: string) => (lastName: string) =>
  `Hello, ${name} ${lastName}`;

console.log(sayHi("John")("Doe")); // Result: Hello, John Doe

const reverseSayHi = flip(sayHi);

console.log(reverseSayHi("Doe")("John")); // Result: Hello, John Doe

Flipping the order of arguments in curried functions with fp-ts

Answer №1

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