JavaScript how to make your own method

"Learn how to create custom methods in Javascript using an example of using a date object to add days to a date."

Creating Your Own JavaScript Method

JavaScript provides a number of built-in methods, but you can create your own methods as well. This can be useful for organizing your code and making it easier to read and maintain. Creating your own methods is a great way to make your code more efficient and reusable.

To create your own methods in JavaScript, you need to use the function keyword. Here is an example of how to create a function that calculates the area of a circle:

function calculateCircleArea(radius) {
  return Math.PI * radius * radius;
}

This creates a function called calculateCircleArea which takes one argument, the radius of the circle. The function then calculates the area of the circle based on the supplied radius and returns the result. The above example uses the built-in Math.PI value to calculate the area, but you could also use other methods or calculations as needed.

Once you have defined your method, you can call it as needed. Here is an example of how to call the above calculateCircleArea method:

let area = calculateCircleArea(2);
console.log(area); // 12.566370614359172

The above code calls the calculateCircleArea function with an argument of 2 which is the radius of the circle. The result of the calculation is assigned to a variable called area and then logged to the console. In this example, the result is 12.566370614359172.

Creating your own methods in JavaScript is a great way to make your code more efficient, organized, and reusable. Once you have defined your method, you can call it as needed and use it to simplify your code.