Javascript Currying and Partial Application Examples

currying.js

// Javascript Currying and Partial Application Examples

const multiplier = x => {
  return (y, z) => {
    return z * y * z
  }
}

const mult = multiplier(10) // x
mult(20, 30) // y, z


// great example

const discount = discount => {
  return price => {
    return price * discount
  }
}

const tenPercentDiscount = discount(0.1) // 10%
const twentyPercentDiscount = discount(0.2) // 20%

tenPercentDiscount(500)
twentyPercentDiscount(650)

// General Curry Function

function curry (fn, ...args) {
  return (..._arg) => {
    return fn(...args, ..._arg)
  }
}
function volume (l, h, w) {
  return l * h * w
}

const hCy = curry(volume, 100)

hCy(200, 900)
hCy(70, 60)