javascript make a function promise code example

Example 1: .promise()

var promise = new Promise(function(resolve, reject) {
  // do some long running async thing…
  
  if (/* everything turned out fine */) {
    resolve("Stuff worked!");
  }
  else {
    reject(Error("It broke"));
  }
});

Example 2: making promises in js

getData()
    .then(data => console.log(data))
    .catch(error => console.log(error));