partial-before-1.js

function sumOfThreeNumbers (x, y, z) {
  return x + y + z
}

// roughly equivalent ways to do the same thing:
const sumPlusTwo = sumOfThreeNumbers.bind(null, 2)
const sumPlusTwo = _.partial(sumOfThreeNumbers, 2) // using lodash
const sumPlusTwo = (y, z) => sumOfThreeNumbers(2, y, z)

sumPlusTwo(4, 4)
// -> 10