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callback() function with example

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pra's play answered on December 5, 2019 Popularity 10/10 Helpfulness 1/10

answer callback() function with example

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callback() function with example

Comment

const checkfile = (x,callback)=>{
    if(typeof x !== 'number')
    return callback('not a number'); //(err,{})
    
    callback(false,'yes it is');
}


checkfile(4,(err, data)=>{
    if(err)
    console.log(err);
    else 
    console.log(err);
})

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: function javascript

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Contributed on Aug 10 2022

pra's play

0 Answers Avg Quality 2/10

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callback function

Comment

function greeting(name) {
  alert('Hello ' + name);
}

function processUserInput(callback) {
  var name = prompt('Please enter your name.');
  callback(name);
}

processUserInput(greeting);

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Source: Grepper

Tags: callback callbac

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Contributed on Dec 05 2019

European Badger

0 Answers Avg Quality 2/10

what are callback functions

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// A function which accepts another function as an argument
// (and will automatically invoke that function when it completes - note that there is no explicit call to callbackFunction)
funct printANumber(int number, funct callbackFunction) {
    printout("The number you provided is: " + number);
}

// a function which we will use in a driver function as a callback function
funct printFinishMessage() {
    printout("I have finished printing numbers.");
}

// Driver method
funct event() {
   printANumber(6, printFinishMessage);
}

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Source: stackoverflow.com

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Contributed on May 25 2020

Difficult Dingo

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callback function

Comment

//Callback functions - are functions that are called AFTER something happened

  const foo = (number, callbackFunction) => {
    //first 
    console.log(number)
    
    //second - runs AFTER console.log() happened
    callbackFunction()
  }

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Source: Grepper

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Contributed on Nov 15 2020

Ivan Fenchyn

0 Answers Avg Quality 2/10

Callback Functions

Comment

const isEven = (n) => {
  return n % 2 == 0;
}

let printMsg = (evenFunc, num) => {
  const isNumEven = evenFunc(num);
  console.log(`The number ${num} is an even number: ${isNumEven}.`)
}

// Pass in isEven as the callback function
printMsg(isEven, 4); 
// Prints: The number 4 is an even number: True.

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Source: www.codecademy.com

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Contributed on Dec 20 2022

Mark Laurence Tinte

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Callback function

Comment

Callback function

const message = function() {  
    console.log("This message is shown after 3 seconds");
}
 
setTimeout(message, 3000);

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Source: www.freecodecamp.org

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Contributed on Feb 06 2023

Better Bison

0 Answers Avg Quality 2/10

Callback Function

Comment

function greeting(name) {
  alert(`Hello, ${name}`);
}

function processUserInput(callback) {
  const name = prompt("Please enter your name.");
  callback(name);
}

processUserInput(greeting);

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Source: developer.mozilla.org

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Contributed on Oct 12 2022

Rineesh Ramadasan

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callback function

Comment

const ironMan = withGloves(withBoots(withArmor(withHelmet(TonyStark))));

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Source: Grepper

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Contributed on May 14 2020

Sobeshot

0 Answers Avg Quality 2/10

callback function

Comment

const nums = [1, 2, 3];
const printDoublePlusOne = n => console.log(2 * n + 1);

nums.map(printDoublePlusOne); // LOGS: 3, 5, 7

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.30secondsofcode.org

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Contributed on Jan 09 2024

Himanshu Jangid

0 Answers Avg Quality 2/10

callback function

Comment

const nums = fetch('https://api.nums.org'); // Suppose the response is [1, 2, 3]
const printDoublePlusOne = n => console.log(2 * n + 1);

nums.then(printDoublePlusOne); // LOGS: 3, 5, 7

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Source: www.30secondsofcode.org

Tags: callback callbac

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Contributed on Jan 09 2024

Himanshu Jangid

0 Answers Avg Quality 2/10

callback() function with example

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