Chapter VI · Functions

Calling Functions

Invoking or calling a function executes the code statements contained within its block.

01 How It Works

Think of pressing the play button on a media player.

Appending parentheses () to a function reference triggers the execution engine.

example.js

function run() {
  console.log("Running...");
}
run(); // Calling the function

Here is how you might see this concept applied in real-world code:

practical.js

function alertUser() {
  console.log("Alert triggered!");
}
alertUser();

Key Takeaway

Functions do nothing until explicitly invoked or called.