as

partial-curry.js

// Partial application and currying are two different techniques for specializing a generalized function

// Partial application takes some of the arguments now and then takes all of the rest arguments later

 function partial(fn, ...firstArgs) {
  return function applied(...lastArgs) {
    return fn(...firstArgs, ...lastArgs);
  };
}

// generalized function
const mult = (x, y) => x * y;

// specialized function
const multBy10 = partial(mult, 10);

 multBy10(5); // 50


/**
 * currying takes one argument at time 
 */

function curry(fn, arity = fn.length ) {
  return (function nextCurried(prevArgs) {
    return function curried(nextArg) {
      const args = [...prevArgs, nextArg];
      if (args.length >= arity) {
          return fn(...args);
      } else {
          return nextCurried(args);
      }
    };
  }([]));
}


const makePoint = (x, y, z) => ({ x, y, z });

const curriedPoint = curry(makePoint); 

const x =  curriedPoint(1);

const y = x(2);

const z = y(5);

curriedPoint(1)(2)(5);