What is the JavaScript Event Loop?

What is the JavaScript Event Loop?

Mozilla says: “JavaScript has a concurrency model based on an event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks. This model is quite different from models in other languages like C and Java.”

For beginners it is difficult to understand how the execution order in JavaScript works, how the code runs.

Mozilla says: “JavaScript has a concurrency model based on an event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks. This model is quite different from models in other languages like C and Java.”

Okay, but what does that mean? To find out, you have to know about some basic phrases like call stack, heap, Web API, callback queue.

So probably you have heard a lot that JavaScript is a single threaded language which means it has only one call stack and one memory heap (about the heap you only have to know at this point that: all the memory allocation to variables and objects happen in this mostly unstructured region of the memory). Let’s have a look at this from closer: Call stack is a mechanism that the JavaScript interpreter uses to “know” what function is currently being run and what functions are called from within that function.

javascript

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