Скачать или смотреть JavaScript Promises In 90 Seconds

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The Promise object represents the eventual completion or failure of an asynchronous operation, and its resulting value. It’s like a placeholder for a value that you are waiting on.

A Promise can be in one of three states: Pending, Fulfilled, or Rejected.

When the promise is pending, JavaScript continues code execution. This way the promise, or value that you are waiting for, does not cause your program to freeze.

Eventually the promise is either fulfilled or rejected and JavaScript goes back to that code block to execute the appropriate operation.

We use “.then” to look for the promise to enter the Fulfilled state. “.then” accepts a function that receives the resolved value from the resolve method.

After that we can use “.catch” to look for the promise to enter the Rejected state. “.catch” also accepts a function that receives any errors from our reject method.

I'll be releasing a new video every day in January! Stay tuned..
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