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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:

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

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <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>
</head>
<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:

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

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.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to reverse the bits of a given 16 bits unsigned short integer.
Next: Write a JavaScript program to check if all the digits in a given number are the same or not.

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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