How to Use JavaScript Arrow Functions with No Parameters

In this task, we will learn about JavaScript arrow functions with no parameters in a simple and easy way. Arrow functions were introduced in ES6 to make JavaScript code shorter, cleaner, and more readable.

These functions are commonly used when :

• No input values are required
• The function performs a small task

Standard Function vs Arrow Function

Traditional Function

To a traditional function, we also call a standard function. Before the introduction of ES6, JavaSccript function were written using the function keyword. This is the classic and most basic way to define a function in JavaScript.

Syntax :

function functionName() {
    //function body
}

The above is the syntax of the standard function.

Example :

function sayhello() {
   console.log("Hello, sir!");
}

In this example, the function keyword is used to create the function. The function name is sayhello, and the code inside {} runs when the function is called using sayhello().

Output :

Hello, sir!

Arrow Function with No Parameters

Arrow functions were introduced in ES6 to provide a shorter and more modern way to write functions in JavaScript. When an arrow function does not take any parameters, it follows a specific syntax that must be written correctly.

Syntax :

const functionName = () => {
     // function body
};

The above is the syntax of the Arrow function with no Parameters.

Example :

const sayhelloArrow = () => {
    console.log("Hello, Sir!");
};

In this example, const is used to store the function in a variable. The function name is sayhelloArrow. The empty parentheses () show that the function takes no parameters, and the => symbol is used instead of the function keyword. The code inside {} runs when the function is called.

The function is called using :

sayhelloArrow();

OutPut :

Hello, Sir!

When an arrow function does not accept any arguments, empty parentheses () are mandatory.

() => {
   // function body
}

This rule is important because, unlike a one-parameter arrow function, a zero-parameter arrow function always requires ().

Example 1: Basic console Logging

This example demonstrates a simple arrow function that prints a message to the console.

const showMessage = () => {
    console.log("Welcome to JavaScript Arrow Functions!");
};


showMessage();

OutPut :

Welcome to JavaScript Arrow Functions!

This type of function is useful when we want to display a message or run a small block of code without taking any input.

Example 2: Implicit Return (One-Liner Function)

If an arrow function contains only one statement and that statement returns a value, then you can remove the curly braces {} and the return keyword.

const getGreetingShort = () => "Hello, sir!";

console.log(getGreetingShort());

OutPut :

Hello, sir!

This one-line syntax makes the code shorter and is widely used in modern JavaScript