calculateVolumeSphere()

Step 1: Understanding the problem

We are asked to calculate the volume of a sphere. The formula to calculate the volume of a sphere is given by: V = 4/3 * π * r^3, where V is the volume, π (Pi) is a constant approximated to 3.14159 or Math.PI in JavaScript, and r is the radius of the sphere.

Let's start by declaring a function with a name calculateVolumeSphere and a parameter radius. Here is how it looks so far:

javascript
function calculateVolumeSphere(radius) {  
}

Step 2: Input validation

Before we proceed, it is important to validate the input. We need to check whether the provided radius is a number and is greater than zero.

function calculateVolumeSphere(radius) {
  if (typeof radius !== 'number' || radius <= 0) {
    return 'Invalid input';
  }
}

Step 3: Performing the calculations

Now we can perform our main volume calculation. We will follow the formula V = 4/3 * π * r^3. In JavaScript, we can use Math.pow(r, 3) to represent r^3.

function calculateVolumeSphere(radius) {
  if (typeof radius !== 'number' || radius <= 0) {
    return 'Invalid input';
  }
  var volume = 4/3 * Math.PI * Math.pow(radius, 3);
}

Step 4: Return the result

Finally, we will return the calculated volume from our function.

function calculateVolumeSphere(radius) {
  if (typeof radius !== 'number' || radius <= 0) {
    return 'Invalid input';
  }
  var volume = 4/3 * Math.PI * Math.pow(radius, 3);
  return volume;
}

Conclusion

And that covers it! With this function, one can easily calculate the volume of a sphere in Javascript using the given radius. Note that this function assumes a valid radius input and will return 'Invalid input' for non-numeric or non-positive values. Here is the full code function for reference.

function calculateVolumeSphere(radius) {
  if (typeof radius !== 'number' || radius <= 0) {
    return 'Invalid input';
  }
  var volume = 4/3 * Math.PI * Math.pow(radius, 3);
  return volume;
}