Pizza Topping Combination Rank

pizza_topping_combo_rank.js

// Assuming you have a json file named pizzas.json in the same directory as this script
// and the JSON file is a list of objects { "toppings" : ["topping1", "topping2"] }
// Determine the 20 most popular pizza topping combinations.
// Output the Combinations, the number of times the combination has been ordered, 
// and the number of times the topping has been used
const fs = require('fs');
const pizzaFile = JSON.parse(fs.readFileSync('./pizzas.json', 'utf8'))
let search = '';
let uniqToppings = []

function findTopping(element) {
  return element.name === search;
}

function rankToppings(){
  pizzaFile.forEach((toppings) => {
    toppings.toppings.forEach(topping => {
      search = topping;
      let found = uniqToppings.findIndex(findTopping);
      found == -1 ? uniqToppings.push({name: topping, rank: 1}) : uniqToppings[found].rank += 1;
    })
  });
}

function findCombo(element){
  if(
    (element.toppings.length == search.length) 
    && element.toppings.every((e, i) => { return search.includes(e); })
  ) {
    return true;
  } else {
    return false;
  }  
}

function rankCombinations() {
  rankToppings();
  let combos = []
  pizzaFile.forEach(combo => {
    search = combo.toppings.filter((e, i) => {
      return combo.toppings.indexOf(e) == i;
    });
    let found = combos.findIndex(findCombo);
    found == -1 ? combos.push({toppings: combo.toppings, rank: 1}) : combos[found].rank += 1;
  });
  combos.sort((a, b) => {
    return b.rank - a.rank;
  });

  for(let i = 0; i < 20; i += 1){
    let toppings = '';
    combos[i].toppings.forEach(topper => {
      search = topper;
      let t = uniqToppings.findIndex(findTopping);
      toppings += `['${topper}' Used: ${uniqToppings[t].rank}]`
    }) 
    console.log(`Topping Combo: ${toppings} Rank: ${combos[i].rank}`);
  }  
}

rankCombinations()