gistfile1.txt

function multiple(x, y) { 
    return x * y
}

function multipleByN(n) {
    return (m) => multiple(n, m)
}

const multipleBy3 = multipleByN(3)
const multipleBy5 = multipleByN(5)

console.log(multipleBy3(10) === 30)
console.log(multipleBy5(7) === 35)

function partialApplication(fn, n) {
    return (m) => fn(n, m)
}

const multipleBy6 = partialApplication(multiple, 6)
console.log(multipleBy6(3) === 18)

// Output
// true
// true
// true