Funções de exemplos envoltas em promises

promised_samples.js

const Promised = {
  getRandom(from, to) {
    return new Promise((resolve) => {
      getRandom(from, to, (value) => {
        resolve(value);
      });
    });
  },
  sum(x, y) {
    return new Promise((resolve) => {
      sum(x, y, (value) => {
        resolve(value);
      });
    });
  },
  display(value) {
    return new Promise((resolve) => {
      display(value, (success) => {
        resolve(success);
      })
    });
  }
}