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JavaScript: Check whether all the digits in a given number are the same or not

JavaScript Basic: Exercise-140 with Solution

Write a JavaScript program to check whether all the digits in a given number are the same or not.

Pictorial Presentation:

JavaScript: Check whether all the digits in a given number are the same or not.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Check whether all the digits in a given number are the same or not</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function test_same_digit(num) {
  var first = num % 10;
  while (num) {
    if (num % 10 !== first) return false;
num = Math.floor(num / 10);
  }
  return true
}

console.log(test_same_digit(1234));
console.log(test_same_digit(1111));
console.log(test_same_digit(22222222));

Sample Output:

false
true
true

Flowchart:

Flowchart: JavaScript - Check whether all the digits in a given number are the same or not

ES6 Version:

function test_same_digit(num) {
  const first = num % 10;
  while (num) {
    if (num % 10 !== first) return false;
num = Math.floor(num / 10);
  }
  return true
}

console.log(test_same_digit(1234));
console.log(test_same_digit(1111));
console.log(test_same_digit(22222222));

Live Demo:

See the Pen javascript-basic-exercise-140 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: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.
Next: Write a JavaScript program to find the number of elements which presents in both of the given arrays.

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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