Why typed arrays matter in Typescript - See It in Action

Why typed arrays matter

📖 Scenario: Imagine you are managing a list of ages for a group of people. You want to make sure that all ages are numbers and avoid mistakes like adding text by accident.

🎯 Goal: You will create a typed array in TypeScript to store ages, add a new age, and then print the list. This will show why typed arrays help keep data clean and safe.

📋 What You'll Learn

Create a typed array of numbers called ages with exact values 25, 30, and 35

Create a variable called newAge and set it to 40

Add newAge to the ages array using the push method

Print the ages array using console.log

💡 Why This Matters

🌍 Real World

Typed arrays are used in real apps to keep data clean, like storing user ages, prices, or names safely.

💼 Career

Understanding typed arrays is important for writing reliable TypeScript code in jobs involving web development or software engineering.

1

Create a typed array of numbers

Create a typed array of numbers called ages with the exact values 25, 30, and 35.

Typescript

# Your code here

Need a hint?

Use const ages: number[] = [...] to create a typed array of numbers.

2

Create a new age variable

Create a variable called newAge and set it to the number 40.

Typescript

const ages: number[] = [25, 30, 35];
# Your code here

Need a hint?

Use const newAge: number = 40; to create the variable.

3

Add the new age to the array

Add the variable newAge to the ages array using the push method.

Typescript

const ages: number[] = [25, 30, 35];
const newAge: number = 40;
# Your code here

Need a hint?

Use ages.push(newAge); to add the new age.

4

Print the ages array

Print the ages array using console.log.

Typescript

const ages: number[] = [25, 30, 35];
const newAge: number = 40;
ages.push(newAge);
# Your code here

Need a hint?

Use console.log(ages); to show the array.