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JavaScript Functions

Functions in JavaScript are reusable blocks of code that can be called multiple times with different arguments. Functions allow you to encapsulate logic in a single unit and make your code more organized and readable.

Here is an example of a simple function in JavaScript:

function greet(name) {
  console.log("Hello " + name + "!");
}

greet("John"); // Hello John!
greet("Jane"); // Hello Jane!

In the example, the function greet takes a single argument name and logs a greeting to the console. The function can be called multiple times with different values for name, allowing you to reuse the same logic in multiple places.

Functions can also return a value. The return keyword is used to specify the value that a function should return.

Here is an example of a function that returns a value:

function square(x) {
  return x * x;
}

let result = square(5);
console.log(result); // 25

In the example, the function square takes a single argument x and returns the square of x. The value returned by the function is assigned to the variable result and logged to the console.

Functions are a fundamental aspect of JavaScript and are used to encapsulate logic, make code more modular and readable, and allow for code reuse.



Next: Document Object Model (DOM)

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