জাভাস্ক্রিপ্ট ফাংশন

<script>
  function message() {
    document.write("হ্যালো বিশ্ব");
  }

  message();
</script>

<script>
  function message() {
    document.write("হ্যালো বিশ্ব");
  }

  message();
</script>

<script>
  function message() {
    return "হ্যালো বিশ্ব";
  }

  document.write(message());
</script>

<script>
  function message() {
    return "হ্যালো বিশ্ব";
  }

  document.write(message());
</script>

<script>
const message = text => text;

document.write(
  message("হ্যালো বিশ্ব")
);
</script>

<script>
function user(name, land) {
  return `${name} - ${land}`;
}

document.write(user("আরিফ", "বাংলাদেশ"));
</script>

<script>
function user(name, land) {
  document.write(`${name} - ${land}`);
}

user("আরিফ", "বাংলাদেশ");
</script>

<script>
function user(name, land = "বাংলাদেশ") {
  return `${name} - ${land}`;
}

document.write(user("আরিফ"));
</script>

<script>
function reference(data) {
  data.number = 123456;
}

const value = {
  number: 100
};

reference(value);

document.write(value.number);
</script>

<script>
function sum(a, b, c, d) {
  return a + b + c + d;
}

const numbers = [10, 15, 10, 25];

document.write(sum(...numbers));
</script>

<script>
function user({name, land}) {
  document.write(`${name} - ${land}`);
}

user({name: "আরিফ", land: "বাংলাদেশ"});
</script>

<script>
const text = "হ্যালো বিশ্ব";

const message = () => text;

document.write(message());
</script>

<script>
function counter(number) {

  if(number <= 0) {
    return;
  }

  document.write("নাম্বার: " + number + "<br>");

  counter(number - 1);
}

counter(10);
</script>

<script>
function outer() {

  function inner() {
    return "হ্যালো বিশ্ব";
  }

  return inner();
}

document.write(
  outer()
);
</script>

<script>
function message() {
  return "হ্যালো বিশ্ব";
}

const func = message;

document.write(func());
</script>

<script>
function message(text) {
  return text;
}

function call(callback) {
  document.write(callback("হ্যালো বিশ্ব"));
}

call(message);
</script>

<script>
function user() {
  return ["আরিফ", "বাংলাদেশ"];
}

const [name, land] = user();

document.write(`${name} - ${land}`);
</script>