Function Expressions

A function expression is a way to create a function without a formal function declaration. It's an anonymous function definition assigned to a variable or used directly within an expression.

Imagine you need a quick tool to complete a small task. Instead of creating a whole named function, you can define a function expression on the fly and assign it to a variable for later use. It's like creating a temporary tool for a specific job.

// Function expression assigned to a variable
const greet = function(name) {
	return `Hello, ${name}!`;
};

const message = greet("Alice");
console.log(message); // Output: Hello, Alice!

In above example, we define a function expression that takes one argument, name. It's assigned to the variable greet. Notice the function keyword followed by an optional name (can be omitted for anonymous functions) and parentheses.

We call the function using the assigned variable greet with the argument "Alice". The function returns the greeting message for "Alice".