anonymous function in JavaScript

An anonymous function in JavaScript is a function without a name.
It’s usually used when a function is needed only once, such as in callbacks, event listeners, or immediately invoked functions.

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⚡ Example:

// Anonymous function assigned to a variable
const greet = function() {
  console.log("Hello, PC!");
};

greet(); // Output: Hello, PC!

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💡 Example in Callback:

setTimeout(function() {
  console.log("Executed after 2 seconds");
}, 2000);

Here, the function has no name, and it’s executed after 2 seconds — perfect for short, one-time tasks.

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🚀 Arrow Function (Modern Anonymous Function)

setTimeout(() => {
  console.log("This is an arrow anonymous function");
}, 1000);

Arrow functions are just shorter syntax for anonymous functions.

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🧠 Key Points:

• No function name (defined inline).
• Commonly used for callbacks, IIFE, and event handlers.
• Can be assigned to variables or passed as arguments.
• Cannot be reused elsewhere (unlike named functions).

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🔍 Example: Event Listener

document.getElementById("btn").addEventListener("click", function() {
  console.log("Button clicked!");
});

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