curried-add.js

// finished version of https://youtu.be/yIcve5wIuAg

function add(...args) {
  function curriedAdd(...args2) {
    return add(...args, ...args2)
  }
  curriedAdd.value = args.reduce((total, current) => total + current)
  return curriedAdd
}


console.assert(add(2, 5, 1).value === 8, 'does not work first case')
console.assert(add(2)(5)(1).value === 8, 'does not work for second case')

console.log(add(2)(5)(1).value)

Why not adding:

Object.defineProperty(curriedAdd, 'value', {
  get: () => args.reduce((total, current) => total + current)
});

This would avoid computing reduce many time for nothing.