Editing JavaScript/JScript (section)

===Promises===
The Promise object represents the eventual (irgendwann) completion (or failure) of an asynchronous operation and its resulting value. At their most basic, [https://web.dev/promises/ promises] are a bit like event listeners except:
* A promise can only succeed or fail once. It cannot succeed or fail twice, neither can it switch from success to failure or vice versa.
* If a promise has succeeded or failed and you later add a success/failure callback, the correct callback will be called, even though the event took place earlier.

A promise can be:
* '''fulfilled''' - The action relating to the promise succeeded
* '''rejected''' - The action relating to the promise failed
* '''pending''' - Hasn't fulfilled or rejected yet
A promise is said to be '''settled''' if it is either fulfilled or rejected, but not pending.

The eventual state of a pending promise can either be fulfilled with a value or rejected with a reason (error). When either of these options occur, the associated handlers queued up by a promise's then method are called:
* The '''.then()''' method takes up to two arguments; the first argument is a callback function for the fulfilled case of the promise, and the second argument is a callback function for the rejected case. Each .then() returns a newly generated promise object

The '''Promise.resolve()''' method "resolves" a given value to a Promise.