Retrieves a json body of the few thousand most common pizza topping combos. This fetches, flattens, and sorts the collection into a Map, and returns the top 20 individual toppings. Solution is 280B.

pizza.js

import f from 'node-fetch';
let M=new Map();
f('https://www.olo.com/pizzas.json').then(r=>r.json()).then(p=>{
    p.forEach(c=>[...c.toppings].forEach(c=>!M.has(c)?M.set(c,0):M.set(c,M.get(c)+1)));
    console.log([...M.entries()].sort((a,b)=>a[1]>b[1]?-1:a[1]<b[1]?1:0).splice(0,20));
});

// Returns this:
/*
[
  [ 'pepperoni', 6334 ],
  [ 'four cheese', 1610 ],
  [ 'mozzarella cheese', 1460 ],
  [ 'bacon', 1446 ],
  [ 'beef', 1139 ],
  [ 'sausage', 830 ],
  [ 'mushrooms', 732 ],
  [ 'italian sausage', 671 ],
  [ 'black olives', 455 ],
  [ 'chicken', 400 ],
  [ 'pineapple', 359 ],
  [ 'ham', 340 ],
  [ 'jalapenos', 257 ],
  [ 'green peppers', 205 ],
  [ 'canadian bacon', 173 ],
  [ 'diced white onions', 167 ],
  [ 'cheddar cheese', 153 ],
  [ 'diced tomatoes', 127 ],
  [ 'alredo sauce', 126 ],
  [ 'onions', 120 ]
]
*/