Function parameters in Javascript - Mini Project: Build & Apply

Function parameters

📖 Scenario: You are creating a simple calculator that adds two numbers. You will write a function that takes two numbers as inputs and returns their sum.

🎯 Goal: Build a function called addNumbers that takes two parameters and returns their sum. Then call the function with specific numbers and display the result.

📋 What You'll Learn

Create a function named addNumbers with two parameters: num1 and num2

Inside the function, return the sum of num1 and num2

Call the function with the numbers 5 and 7

Print the result using console.log

💡 Why This Matters

🌍 Real World

Functions with parameters are used everywhere in programming to reuse code and perform tasks with different inputs.

💼 Career

Understanding how to write and use functions with parameters is essential for any programming job, as it helps build clean and efficient code.

1

Create the function skeleton

Write a function named addNumbers that takes two parameters called num1 and num2. For now, leave the function body empty.

Javascript

function addNumbers(num1, num2) {
  // Your code here
}

Need a hint?

Use the function keyword followed by the function name and parentheses with parameters.

2

Add the return statement

Inside the addNumbers function, write a return statement that returns the sum of num1 and num2.

Javascript

function addNumbers(num1, num2) {
  // Your code here
}

Need a hint?

Use return num1 + num2; to send back the sum.

3

Call the function with numbers

Create a variable called result and assign it the value returned by calling addNumbers with the numbers 5 and 7.

Javascript

function addNumbers(num1, num2) {
  return num1 + num2;
}

// Your code here

Need a hint?

Use const result = addNumbers(5, 7); to call the function and save the answer.

4

Display the result

Use console.log to print the value of the variable result.

Javascript

function addNumbers(num1, num2) {
  return num1 + num2;
}

const result = addNumbers(5, 7);

// Your code here

Need a hint?

Use console.log(result); to show the sum in the console.