how to wait for function to finish in JS

Zany Zebra answered on June 15, 2022 Popularity 10/10 Helpfulness 1/10

answer how to wait for function to finish in JS

related javascript wait for function to finish

how to wait for function to finish in JS

Comment

function firstFunction(_callback){
    // do some asynchronous work
    
   let x= _callback(20);                                                      
       console.log("x=>",x)                                                 
     console.log("fahm")   
}

function secondFunction(){
    // call first function and pass in a callback function which
    // first function runs when it has completed
    firstFunction(function(a) {
        let x=0;                                                                   
            for (i=0; i<a; i++) {
               x=x+1
            }
             return x;
    })
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: function javascript wait

Link to this answer
Share Copy Link

Contributed on Jul 24 2022

Zany Zebra

0 Answers Avg Quality 2/10

Closely Related Answers

javascript wait for function to finish

Comment

/*
 * JavaScript is executed synchronously, meaning each
 * line of code is executed in the order it appears in.
 * To wait for a function to finish, simply call it...
 * Any code after it will be called after it has
 * finished.
 */
function fizzbuzz(n) {
	// (this is just the most common and easy to code version)
	if (n % 3 === 0 && n % 5 === 0) {
		return "fizzbuzz";
	} else if (n % 3 === 0) {
		return "fizz";
	} else if (n % 5 === 0) {
		return "buzz";
	}
	return n;
}

console.log(fizzbuzz(15));
console.log("This code is run after `fizzbuzz` finishes");

/*
 * The only exception to the above, is asynchronous
 * functions. An asynchronous function is not run in sync
 * with the rest of the code which is often useful. To
 * run an asynchronous function synchronously, you can
 * use the await keyword. Alternatively (and probably
 * better in most contexts) you can use the `then` and
 * `catch` methods of the promise returned by an
 * asynchronous function (or just use a promise instead
 * of an asynchronous function) to get the value returned
 * by an asynchronous function and exectute code after it
 * has run.
 */
async function fizzbuzz(n) {
	if (n % 3 === 0 && n % 5 === 0) {
		return "fizzbuzz";
	} else if (n % 3 === 0) {
		return "fizz";
	} else if (n % 5 === 0) {
		return "buzz";
	}
	throw new Error("Nice catch!");
}

fizzbuzz(15).then((res) => {
	console.log(res);
	console.log("This is run after `fizzbuzz` finishes (and so is the above `console.log`...)");
}).catch((err) => {
	console.error(err);
	console.log("This is run after `fizzbuzz` finishes (and so is the above `console.error`...)");
});






// Bonus, a more concise fizzbuzz:
const fizzbuzz = ( n ) => n % 15 ? n % 3 ? n % 5 ? n : "buzz" : "fizz" : "fizzbuzz";

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: function functio

Link to this answer
Share Copy Link

Contributed on Jun 15 2022

MattDESTROYER

0 Answers Avg Quality 2/10

how to wait for function to finish in JS

Contents

More Related Answers

how to wait for function to finish in JS

Closely Related Answers

javascript wait for function to finish

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.