 # JavaScript: Find the position of a rightmost round number in an array of integers. Returns 0 if there are no round number

## JavaScript Basic: Exercise-139 with Solution

Write a JavaScript program to find the position of a rightmost round number in an array of integers. Returns 0 if there are no round number.

Note: A round number is informally considered to be an integer that ends with one or more zeros.

Pictorial Presentation: Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Find the position of a rightmost round number in an array of integers. Returns 0 if there are no round number</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function find_rightmost_round_number(input_arr) {

var result = 0;
for (var i = 0; i < input_arr.length; i++)
{
if (input_arr[i] % 10 === 0) {
result = i;
}
}

return result;
}

console.log(find_rightmost_round_number([1, 22, 30, 54, 56]));
console.log(find_rightmost_round_number([1, 22, 32, 54, 56]));
console.log(find_rightmost_round_number([1, 22, 32, 54, 50]));
``````

Sample Output:

```2
0
4
```

Flowchart: ES6 Version:

``````function find_rightmost_round_number(input_arr) {

let result = 0;
for (let i = 0; i < input_arr.length; i++)
{
if (input_arr[i] % 10 === 0) {
result = i;
}
}

return result;
}

console.log(find_rightmost_round_number([1, 22, 30, 54, 56]));
console.log(find_rightmost_round_number([1, 22, 32, 54, 56]));
console.log(find_rightmost_round_number([1, 22, 32, 54, 50]));
``````

Live Demo:

See the Pen javascript-basic-exercise-139 by w3resource (@w3resource) on CodePen.

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## JavaScript: Tips of the Day

Classes/function constructors

```class Person {
constructor() {
this.name = 'Owen';
}
}

Person = class AnotherPerson {
constructor() {
this.name = 'Eddie';
}
};

const member = new Person();
console.log(member.name);
```

We can set classes equal to other classes/function constructors. In this case, we set Person equal to AnotherPerson. The name on this constructor is Eddie, so the name property on the new Person instance member is "Eddie".

Ref: https://bit.ly/3jFRBje