JavaScript: Calculate the volume of a Cylinder

Last update on May 30 2022 10:00:57 (UTC/GMT +8 hours)

JavaScript Object: Exercise-5 with Solution

Write a JavaScript program to get the volume of a Cylinder with four decimal places using object classes.
Volume of a cylinder : V = πr²h
where r is the radius and h is the height of the cylinder.

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Volume of a Cylinder</title>
</head>
<body>
</body>
</html>

JavaScript Code:

function Cylinder(cyl_height, cyl_diameter) {
  this.cyl_height = cyl_height;
  this.cyl_diameter = cyl_diameter;
}

Cylinder.prototype.Volume = function () {
  var radius = this.cyl_diameter / 2;
  return this.cyl_height * Math.PI * radius * radius;
};

var cyl = new Cylinder(7, 4);
// Volume of the cylinder with four decimal places.
console.log('volume =', cyl.Volume().toFixed(4));

Sample Output:

volume = 87.9646

Flowchart:

Live Demo:

See the Pen javascript-object-exercise-5 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04