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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.

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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

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925

Output:

385
3025
2925