calculateVolumeCylinder()

Step 1: Understanding the problem

The first step towards solving our problem is to understand what we are required to do. We are to write a function in JavaScript that calculates the volume of a cylinder.

The formula used for calculating the volume of a cylinder is V = πr²h. Where:

• V is the volume
• r is the radius of the cylinder
• h is the height of the cylinder
• π is a mathematical constant whose approximate value is 3.14159

    function calculateVolumeCylinder(radius, height) {
      // we will implement our function here
    }

Step 2: Implementing the formula

The next step would be to actually implement the formula in the body of our JavaScript function. We will be using the Math.PI JavaScript property to get the value of π. And the Math.pow() function to calculate the square of the radius.

    function calculateVolumeCylinder(radius, height) {
      // square the radius
      let rSquared = Math.pow(radius, 2);

      // calculate volume
      let volume = Math.PI * rSquared * height;
    }

Step 3: Return the result

Our function currently calculates the volume but does not do anything with the result. In this step, we will return the volume that has been calculated, so it can be used later on.

    function calculateVolumeCylinder(radius, height) {
      let rSquared = Math.pow(radius, 2);
      let volume = Math.PI * rSquared * height;
      
      return volume;
    }

Step 4: Test the function

Our function is now complete, but we need to test it to ensure it's working properly. We will do this by calling the function with example values and logging the result.

    function calculateVolumeCylinder(radius, height) {
      let rSquared = Math.pow(radius, 2);
      let volume = Math.PI * rSquared * height;
      
      return volume;
    }

    console.log(calculateVolumeCylinder(5, 10)); // should evaluate to approximately 785.4

Conclusion

Conclusively, with those four simple steps, we have successfully written a JavaScript function to calculate the volume of a cylinder. It is always important to understand the task first, break down the problem, come up with a plan of action and test the function after implementation.