Source: What is event loop in JavaScript ?
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The event loop is a critical part of JavaScript’s concurrency model. It is responsible for handling asynchronous operations and event-driven programming in JavaScript. The event loop ensures that JavaScript remains responsive to user interactions and can handle tasks like network requests, timers, and callbacks efficiently.
JavaScript is single-threaded, meaning it can only execute one task at a time. However, it often needs to perform non-blocking operations like fetching data from a server or waiting for user input. The event loop helps manage these operations by allowing JavaScript to handle multiple tasks concurrently without blocking the main execution thread.
Here’s a simplified explanation of how the event loop works:
- Call Stack: JavaScript maintains a call stack, which keeps track of the currently executing function. When a function is called, it is added to the top of the stack. When a function completes, it is removed from the stack, and the next function in line can execute.
- Task Queue: JavaScript also maintains a task queue, which holds tasks that are ready to be executed. These tasks can…