#currying code explainers

javascript

function curry(fn) {
  return function curried(...args) {
    if (args.length >= fn.length) {
      return fn.apply(this, args);

Building a curry function in JavaScript

currying closures higher-order-functions

Intermediate 7 steps

typescript

type Curried<A extends any[], R> = A extends [infer First, ...infer Rest]
  ? (arg: First) => Rest extends [] ? R : Curried<Rest, R>
  : R;

Type-safe currying in TypeScript

currying conditional-types recursion

Advanced 8 steps

ruby

# Curry a multi-argument lambda so it can be applied one argument at a time.
add = ->(a, b, c) { a + b + c }
 
# Proc#curry returns a curried version that collects arguments incrementally.

Currying lambdas and methods in Ruby

currying closures partial-application

Intermediate 7 steps