Number type behavior in Typescript - Mini Project: Build & Apply

Number type behavior

📖 Scenario: Imagine you are working with numbers in a simple calculator app. You want to understand how numbers behave in TypeScript, including integers, decimals, and special values like Infinity and NaN.

🎯 Goal: You will create variables with different number types, use a helper variable, perform calculations, and finally print the results to see how TypeScript handles these numbers.

📋 What You'll Learn

Create variables with integer, decimal, Infinity, and NaN values

Add a helper variable to hold a multiplier

Use arithmetic operations to calculate new values

Print the final results to the console

💡 Why This Matters

🌍 Real World

Understanding number behavior is important when building calculators, games, or any app that does math calculations.

💼 Career

Many programming jobs require handling numbers correctly, especially when working with financial data, scientific calculations, or user input validation.

1

Create number variables

Create four variables called integerNum, decimalNum, infinityNum, and nanNum with these exact values: 42, 3.14, Infinity, and NaN respectively.

Typescript

// Create the four number variables with the exact values
// Your code here

Need a hint?

Use let to declare each variable and assign the exact number values given.

2

Add a multiplier variable

Create a variable called multiplier and set it to 2.

Typescript

let integerNum = 42;
let decimalNum = 3.14;
let infinityNum = Infinity;
let nanNum = NaN;

// Create the multiplier variable
// Your code here

Need a hint?

Use let multiplier = 2; to create the helper variable.

3

Calculate new values

Create four new variables called intResult, decResult, infResult, and nanResult. Multiply integerNum, decimalNum, infinityNum, and nanNum by multiplier respectively and assign the results to these new variables.

Typescript

let integerNum = 42;
let decimalNum = 3.14;
let infinityNum = Infinity;
let nanNum = NaN;

let multiplier = 2;

// Multiply each number by multiplier and store in new variables
// Your code here

Need a hint?

Use the * operator to multiply each original number by multiplier.

4

Print the results

Use four console.log statements to print intResult, decResult, infResult, and nanResult in this exact order.

Typescript

let integerNum = 42;
let decimalNum = 3.14;
let infinityNum = Infinity;
let nanNum = NaN;

let multiplier = 2;

let intResult = integerNum * multiplier;
let decResult = decimalNum * multiplier;
let infResult = infinityNum * multiplier;
let nanResult = nanNum * multiplier;

// Print the results in order
// Your code here

Need a hint?

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