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node.js event loop

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Shirshak Kandel answered on September 9, 2022 Popularity 10/10 Helpfulness 1/10

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node.js event loop

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1)In event loop all application code that is inside callback functions.(non-top-level code)
(non top level code.)
2)Node js is event-driven architecture.event emitted,event loops picks them up and callbacks are called.

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: Grepper

Tags: event-loop node.js typescript

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Contributed on Oct 09 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

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Nodejs Event loop

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/*
	// A setTimeout() callback with a 0ms delay is very similar to 
    setImmediate(). The execution order will depend on various factors, 
    but they will be both run in the next iteration of the event loop.

	// A process.nextTick callback is added to process.nextTick queue. 
    A Promise.then() callback is added to promises microtask queue. 
    A setTimeout, setImmediate callback is added to macrotask queue.

	// Event loop executes tasks in process.nextTick queue first, and 
    then executes promises microtask queue, and then executes macrotask 
    queue.

// With love @kouqhar

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: nodejs.dev

Tags: event-loop e

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Contributed on Apr 18 2023

kouqhar

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event loop in node js

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//event-loop.js
const fs = require('fs')
setTimeout(()=> console.log('Timer 1 finished'),0)//second console.
setImmediate(()=> console.log('Immediate 1 finsied')) //third consple.
fs.readFile('test-file.txt', ()=> { console.log("I/O finished")}) //last console
console.log("hello from top level code") //first console.

//node event-loop.js to run the file
//result in console.
Hello from the top level code
Timer 1 finished
Immediate 1 finished
I/O finished.

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Contributed on Oct 10 2022

Shirshak Kandel

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node js event loops

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┌───────────────────────────┐
┌─>│           timers          │
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
│  │     pending callbacks     │
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
│  │       idle, prepare       │
│  └─────────────┬─────────────┘      ┌───────────────┐
│  ┌─────────────┴─────────────┐      │   incoming:   │
│  │           poll            │<─────┤  connections, │
│  └─────────────┬─────────────┘      │   data, etc.  │
│  ┌─────────────┴─────────────┐      └───────────────┘
│  │           check           │
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
└──┤      close callbacks      │
   └───────────────────────────┘

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: nodejs.org

Tags: javascript j

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Contributed on Sep 09 2022

Friendly Falcon

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