 # JavaScript: Calculate the volume of a Cylinder

## 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>
<meta charset="utf-8">
<title>Volume of a Cylinder</title>
<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;
};

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 remove a specific item from an array?

Find the index of the array element you want to remove using indexOf, and then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

```const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
array.splice(index, 1);
}

// array = [2, 9]
console.log(array);```

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.

For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:

```function removeItemOnce(arr, value) {
var index = arr.indexOf(value);
if (index > -1) {
arr.splice(index, 1);
}
return arr;
}

function removeItemAll(arr, value) {
var i = 0;
while (i < arr.length) {
if (arr[i] === value) {
arr.splice(i, 1);
} else {
++i;
}
}
return arr;
}
//Usage
console.log(removeItemOnce([2,5,9,1,5,8,5], 5))
console.log(removeItemAll([2,5,9,1,5,8,5], 5))
```

Ref: https://bit.ly/2N9nKRp