Object-Oriented JavaScript — Async Programming

Why we need async code in JavaScript?

JavaScript is partly an object-oriented language.

To learn JavaScript, we got to learn the object-oriented parts of JavaScript.

In this article, we’ll look at JavaScript async programming.

Async Programming

Async programming is an import part of JavaScript apps.

It’s different from the alternative mode, which is synchronous programming.

Synchronous programming is where we run code line by line.

And async programming is where we run some code, then wait for the result.

While we wait for the result, we let other pieces of code in the queue run.

Then once the result is obtained, then we run the code that’s waiting for the result.

This is different in that we aren’t running anything line by line.

We queued up the code and initialize them.

Then once the result is computed, we go back to run the code that’s initialized.

When the code is waiting, the latency isn’t predictable.

So we can’t just run code and then wait for the result without letting other pieces of code run.

JavaScript Call Stack

The call stack is a record of the functions that are called from latest to earliest.

For instance, if we have:

function c(val) {
  console.log(new Error().stack);
}

function b(val) {
  c(val);
}
function a(val) {
  b(val);
}
a(1);

Then we get:

Error
    at c ((index):37)
    at b ((index):41)
    at a ((index):45)
    at (index):47

from the console log.

javascript programming

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