Modifying Arrays

Part of the Fundamentals section of Coddy's JavaScript journey — lesson 59 of 77.

In addition to accessing the elements of an array, you can also modify them. To modify a specific element in an array, you can assign a new value to it using its index.

Here's an example:

let myArray = ["apple", "banana", "cherry"]
myArray[1] = "orange";
console.log(myArray);

Output:

["apple", "orange", "cherry"]

banana was changed to an orange

Challenge

Easy

Create a function named changeElement that receives 3 arguments:

First argument is an array
Second argument is an index
Third argument is a new element

The function will return the modified array by changing the element in an index that is stored in the second argument with the value in the third argument.

For example, with the following arguments: changeElement<strong>(</strong>[1, 2, 3], 0, 9) the function will return [9, 2, 3]

Cheat sheet

To modify an array element, assign a new value using its index:

let myArray = ["apple", "banana", "cherry"];
myArray[1] = "orange";
console.log(myArray); // ["apple", "orange", "cherry"]

Try it yourself

function changeElement(arr, index, newElement) {
    // Write code here
}

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

2Variables

Numbers String Boolean Naming Conventions Empty Variables Recap - Initialize Variables Constants

5Decision Making

If Statement If - Else Recap - Simple Calculator Nested If - Else Switch Statement

8Loops

For Loop While Loop Break Continue Recap - Factorial Do While Loop Nested Loop

11Arrays Part 1

Declaring an Array Accessing Array ElementsModifying ArraysArray Methods Part 1 Array Methods Part 2 Recap - Array Processor

14Final Challenges

Number Pyramid Double The Odds What To Buy