Before Function Injection

function-injection-before.js

function tacoRank(t){
  ...
}

function findBestTacos(restaurants) {
  return restaurants.reduce((acc, next) => { return acc.concat(next.tacos) }, [])
                    .sort((a, b) => { tacoRank(a) - tacoRank(b) })
                    .slice(0, 10);
}