_ = require("lodash")

function timeIntensiveFunction(callback) {
  setTimeout(function() {
    callback("World")
  }, 1000)
}
getAll = _.memoize(function() {
  return new Promise(function(resolve, reject) {
    timeIntensiveFunction(function callback(data) {
      resolve(data);
    })
  });
});

getAll().then(function(result) {
  console.log("Hello", result)
})