Why built-in methods are useful in Javascript - See It in Action

Why built-in methods are useful

📖 Scenario: Imagine you have a list of names of friends you want to invite to a party. You want to quickly check how many friends you have, find if a certain friend is on the list, and sort the names alphabetically.

🎯 Goal: You will create a list of friends and use built-in JavaScript methods to count, check, and sort the names easily.

📋 What You'll Learn

Create an array called friends with these exact names: 'Anna', 'Bob', 'Charlie', 'Diana'

Create a variable called friendToFind and set it to 'Bob'

Use the built-in method includes() on friends to check if friendToFind is in the list and store the result in isFriendFound

Use the built-in method sort() on friends to sort the names alphabetically

Print the number of friends, the result of the search, and the sorted list

💡 Why This Matters

🌍 Real World

In real life, we often need to manage lists like contacts, tasks, or products. Built-in methods help us quickly search, sort, and count items without extra work.

💼 Career

Knowing how to use built-in methods is essential for any programming job because it makes your code efficient and easier to maintain.

1

Create the friends list

Create an array called friends with these exact names: 'Anna', 'Bob', 'Charlie', 'Diana'

Javascript

# Your code here

Need a hint?

Use square brackets [] to create an array and separate names with commas.

2

Set the friend to find

Create a variable called friendToFind and set it to 'Bob'

Javascript

const friends = ['Anna', 'Bob', 'Charlie', 'Diana'];
# Your code here

Need a hint?

Use const to create a variable and assign the string 'Bob'.

3

Check if the friend is in the list and sort the list

Use the built-in method includes() on friends to check if friendToFind is in the list and store the result in isFriendFound. Then use the built-in method sort() on friends to sort the names alphabetically.

Javascript

const friends = ['Anna', 'Bob', 'Charlie', 'Diana'];
const friendToFind = 'Bob';
# Your code here

Need a hint?

Use includes() to check presence and sort() to order the array.

4

Print the results

Print the number of friends using friends.length, the value of isFriendFound, and the sorted friends array.

Javascript

const friends = ['Anna', 'Bob', 'Charlie', 'Diana'];
const friendToFind = 'Bob';
const isFriendFound = friends.includes(friendToFind);
friends.sort();
# Your code here

Need a hint?

Use console.log() to print each result on its own line.