developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Implementing_a_promise-based_API
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The setTimeout() API takes as arguments a callback function and a delay, given in milliseconds. When setTimeout() is called, it starts a timer set to the given delay, and when the time expires, it calls the given function
The key component here is the Promise() constructor. The Promise() constructor takes a single function as an argument. We'll call this function the executor. When you create a new promise you supply the implementation of the executor.
This executor function itself takes two arguments, which are both also functions, and which are conventionally called resolve and reject
How to implement a promise-based API
Implementing an alarm() API
Wrapping setTimeout()
The Promise() constructor
Using the alarm() API
Using async and await with the alarm() API
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