https://egghead.io/lessons/javascript-course-introduction-to-just-enough-functional-programming-in-javascript

 

const withCount = fn => {
    let count = 0;

    return (...args) => {
        console.log(`Call coun: ${++count}`)
        return fn(...args)
    }
}

const add = (x, y) => x + y

 

const countedAdd = withCount(add)

 

console.log(countedAdd(1, 2))
console.log(countedAdd(2, 2))
console.log(countedAdd(3, 2))

 

정답은?