promises

What are Promises?

Answer

The Promise object represents the eventual completion (or failure) of an asynchronous operation, and its resulting value. An example can be the following snippet, which after 100ms prints out the result string to the standard output. Also, note the catch, which can be used for error handling. Promises are chainable.

new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve("result")
  }, 100)
})
  .then(console.log)
  .catch(console.error)

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• Take a look into the other questions regarding Promises!

Additional links

• Master the JavaScript Interview: What is a Promise?