Desafio 1

desafio.js

//dado o array de dictionary abaixo some o total dos valores
let dictionary = [{ '5': 50, '6': 60 }, { 'A': 10 }, { 'YEEZY': 30 }]

dictionary.reduce((acc, val) => acc.concat(Object.values(val)), []).reduce((acc, val) => acc + val, 0)

const dictionary = [{ '5': 50, '6': 60 }, { 'A': 10 }, { 'YEEZY': 30 }],
sum = (valores) => valores.reduce((a, b) => a + b),
valores = dictionary.map(valor => sum(Object.values(valor))).reduce((a,b) => a + b)

Sem reduce e sem callbacks (mas com eval).

eval(JSON.stringify(dictionary).match(/\d+(?!")/g).join('+'));

const obj =  [{ '5': 50, '6': 60 }, { 'A': 10 }, { 'YEEZY': 30 }];
const arrNumbers = () => obj.map(_a => Object.values(_a));
const onlyNumbers = () => [].concat(...arrNumbers());
const result = () => onlyNumbers().reduce((_a, _b) => _a + _b, 0);

function sum_items(list_items) {
  var sum = 0;
  list_items.map(
    function (item) {
      for (var key in item) {
        sum += item[key];
      }
    }
  );
  return sum;
}