Parameters type in Typescript - Mini Project: Build & Apply

Parameters type

📖 Scenario: You are creating a simple program to greet users with their names and ages.

🎯 Goal: Build a TypeScript function that takes parameters with specific types and prints a greeting message.

📋 What You'll Learn

Create a function with typed parameters

Use string and number types for parameters

Call the function with correct arguments

Print the greeting message

💡 Why This Matters

🌍 Real World

Functions with typed parameters help catch mistakes early and make code easier to understand in real projects.

💼 Career

Knowing how to use parameter types is essential for writing safe and clear TypeScript code in professional development.

1

Create a function with typed parameters

Create a function called greet that takes two parameters: name of type string and age of type number.

Typescript

// Your code here

Need a hint?

Use the syntax function functionName(param1: type1, param2: type2) { } to define typed parameters.

2

Add a greeting message inside the function

Inside the greet function, create a variable called message that uses a template string to combine name and age into the text: Hello, my name is {name} and I am {age} years old.

Typescript

function greet(name: string, age: number) {
  // Create a variable called message with the greeting text
  // Your code here
}

Need a hint?

Use backticks ` and ${variable} to create a template string.

3

Print the greeting message inside the function

Add a console.log statement inside the greet function to print the message variable.

Typescript

function greet(name: string, age: number) {
  const message = `Hello, my name is ${name} and I am ${age} years old.`;
  // Print the message variable
  // Your code here
}

Need a hint?

Use console.log(variable) to print to the console.

4

Call the function with arguments

Call the greet function with the arguments "Alice" for name and 30 for age.

Typescript

function greet(name: string, age: number) {
  const message = `Hello, my name is ${name} and I am ${age} years old.`;
  console.log(message);
}

// Call the greet function with "Alice" and 30
// Your code here

Need a hint?

Call the function by writing greet("Alice", 30);