Event Loop javascript

Event Loop:-

The event loop is a mechanism in JavaScript that allows the execution of asynchronous code. It is a single-threaded loop that constantly checks for events and then executes the appropriate callback functions.

Hoisting:-

Hoisting refers to the process where the interpreter appears to move the declaration of function, variables, or classes to the top of their scope, period, and execution of the code.

• When JS code runs it creates a global execution context and pushes it into the call stack and after the complete execution of the code it pops out from the call stack.
• If any WEB APIs come then it registers the timer web API or Browser after the timer is expired it pushes into the micro-task queue(high priority, Promises, async/await) or call-back queue (setTimeout, setInterval).
• Event loop watch the call stack if the call stack is empty then it pushes the task from the micro-task queue or call-back/task queue.

Starvation:-

It happens because in the micro-task queue if one executes and creates another call-back function it continuously happens and the micro-task is not free due to this higher priority, it runs again and again whenever the call stack is free and there is no chance of the call-back queue to run, due to this call-back queue going into starvation.