The forEach Method

Part of the Fundamentals section of Coddy's JavaScript journey — lesson 64 of 77.

The forEach method allows you to loop through a sequence (like an array) while keeping track of each item.

Without forEach we would access both the index and the value the following way:

let fruits = ["apple", "banana", "orange"];
for (let i = 0; i < fruits.length; i++) {
    console.log(`Index ${i}: ${fruits[i]}`);
}

forEach is a more elegant way to get both index and value:

let fruits = ["apple", "banana", "orange"];
fruits.forEach((fruit, index) => {
    console.log(`Index ${index}: ${fruit}`);
});

Both examples will output:

Index 0: apple
Index 1: banana
Index 2: orange

Challenge

Easy

Write a program that receives an array of numbers as input (given), and prints an array of the numbers that are either below 50 or are divisible by 5. Use the forEach method.

Cheat sheet

The forEach method allows you to loop through an array while keeping track of each item and its index:

let fruits = ["apple", "banana", "orange"];
fruits.forEach((fruit, index) => {
    console.log(`Index ${index}: ${fruit}`);
});

This is more elegant than using a traditional for loop:

for (let i = 0; i < fruits.length; i++) {
    console.log(`Index ${i}: ${fruits[i]}`);
}

Try it yourself

let arr = inp.split(",").map(Number); // Don't change this line

// Write your code below

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments Code Structure

4Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Type Coercion

7Bill Split Calculator

Welcome Message Calculating The Tip And Total

Splitting The Bill

Formatted Output

10FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

13Grocery List Tracker

Project Overview Add Item

Remove Item

View List