Function Basics

A function is a reusable block of code. You define it once and call it whenever you need it.

Syntax:

function name(parameter1, parameter2) {
  // code
  return result;
}

function greet(name) {
  return "Hello, " + name + "!";
}

console.log(greet("Sara"));
console.log(greet("Bilal"));

Hello, Sara!
Hello, Bilal!

• Parameters are the names in the definition (name).
• Arguments are the actual values you pass in ("Sara").
• return sends a value back and ends the function. Without it, the function returns undefined.