Function expression in Javascript - Mini Project: Build & Apply

Function Expression

📖 Scenario: You are creating a simple calculator that can add two numbers. Instead of using a normal function declaration, you will use a function expression to keep your code neat and flexible.

🎯 Goal: Build a function expression called add that takes two numbers and returns their sum. Then use it to add two numbers and show the result.

📋 What You'll Learn

Create a function expression named add

The function should take two parameters: a and b

The function should return the sum of a and b

Call the add function with the numbers 5 and 7

Print the result of the function call

💡 Why This Matters

🌍 Real World

Function expressions are used in JavaScript to create flexible and reusable blocks of code, often passed as arguments or stored in variables.

💼 Career

Understanding function expressions is essential for writing modern JavaScript code, useful in web development, backend programming, and working with frameworks.

1

Create a function expression

Create a function expression called add that takes two parameters a and b and returns their sum.

Javascript

// Create a function expression named add that takes a and b
// Your code here

Need a hint?

Remember, a function expression is stored in a variable. Use const add = function(a, b) { return a + b; };

2

Call the function expression

Create a variable called result and assign it the value of calling the add function with arguments 5 and 7.

Javascript

const add = function(a, b) {
  return a + b;
};

// Call add with 5 and 7 and store in result
// Your code here

Need a hint?

Call the function like this: add(5, 7) and save it in result.

3

Print the result

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

Javascript

const add = function(a, b) {
  return a + b;
};

const result = add(5, 7);

// Print the result
// Your code here

Need a hint?

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

4

Run and check output

Run the program and check that the output is 12.

Javascript

const add = function(a, b) {
  return a + b;
};

const result = add(5, 7);

console.log(result);  // Check output

Need a hint?

The output should be the sum of 5 and 7, which is 12.