Currying Module

curry.js

/**
 * Curry the given function.
 *
 * @param {Function} fn
 * @param {[...*]} initialArgs
 * @returns {Function|*}
 */
export function curry(fn, ...initialArgs) {
    return curryN(fn.length, fn, ...initialArgs);
}

/**
 * Curry the given function up until the specified arity.
 *
 * @param {number} arity
 * @param {Function} fn
 * @param {[...*]} initialArgs
 * @returns {Function|*}
 */
export function curryN(arity, fn, ...initialArgs) {
  if (arity === 0) return fn;

  return function curried(...args) {
    const combinedArgs = initialArgs.concat(args);
    return (combinedArgs.length >= arity)
      ? fn(...combinedArgs)
      : curryN(arity, fn, ...combinedArgs);
  }
}