---
title: "What is the role of for-of loop in JS?"
description: "What is the role of for-of loop in JS?"
author: "Ravi Vishwakarma"
published: 2021-07-19
canonical: https://answers.mindstick.com/qa/93746/what-is-the-role-of-for-of-loop-in-js
category: "web application"
tags: ["javascript", "web application development", "web development"]
reading_time: 4 minutes
---
# What is the role of for-of loop in JS?
What is the [role](https://www.mindstick.com/forum/2317/how-to-create-role-and-enable-role-in-mvc) of for-of loop in JS?
## Answers
### Answer by user
The for...of statement creates a loop iterating over iterable objects, including built-in String, Array, array-like objects (e.g., arguments or NodeList), TypedArray, Map, Set, and user-defined iterables. It invokes a custom iteration hook with statements to be executed for the value of each distinct property of the object. **Syntax;**
```
for (variable of iterable) {
statement
}
```
**variable** On each iteration a value of a different property is assigned to variable. variable may be declared with const, let, or var. **Iterable** Object whose iterable properties are iterated.
```
Array
const iterable = [10, 20, 30];
for (let value of iterable) {
value += 1;
console.log(value);
}
```
```
String
const iterable = 'boo';
for (const value of iterable) {
console.log(value);
}
```
```
Map
const iterable = new Map([['a', 1], ['b', 2], ['c', 3]]);
for (const entry of iterable) {
console.log(entry);
}
for (const [key, value] of iterable) {
console.log(value);
}
```
```
Set
const iterable = new Set([1, 1, 2, 2, 3, 3]);
for (const value of iterable) {
console.log(value);
}
```
```
object
(function() {
for (const argument of arguments) {
console.log(argument);
}
})(1, 2, 3);
```
\
### Answer by Ethan Karla
**for...of** loop is used to iterate value from array, map, set. This loop iterates the value one by one but in the **for...in** loop it is used to iterate keys from Array, Map, Set. But normally we use for...in in loop used in object iteration.
Syntax
```
for( variable of object){ statement.}
```
Example
```
Execption handling