JavaScript(16)---ASYNC AWAIT

ASYNC AWAIT

The async keyword is used to write functions that handle asynchronous actions. We wrap our asynchronous logic inside a function prepended with the async keyword

• An async function will return in one of three ways:
• If there’s nothing returned from the function, it will return a promise with a resolved value of undefined.
• If there’s a non-promise value returned from the function, it will return a promise resolved to that value.
• If a promise is returned from the function, it will simply return that promise
• await is an operator: it returns the resolved value of a promise.

Since promises resolve in an indeterminate amount of time, await halts, or pauses, the execution of our async function until a given promise is resolved.

When used properly in yesAwait(), the variable value was assigned the resolved value of the myPromise() promise, whereas in noAwait(), value was assigned the promise object itself.

NOTES: To execute a file, we can type node someFileName.js in the terminal and press enter.

With async...await, we use try...catch statements for error handling. 

• Another way to take advantage of concurrency when we have multiple promises which can be executed simultaneously is to await a Promise.all().

Review: 

What I learned today?

I learned to use the keywords to make the functions work and run the way I want it to be. However, I think I should still learned more about this if I have time, as I am not 100% mastered in this.

What I'll be doing tomorrow?

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