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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

Parameter's value

function getItems(fruitList, ...args, favoriteFruit) {
  return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

function getItems(fruitList, favoriteFruit, ...args) {
  return [...fruitList, ...args, favoriteFruit];
}


getItems(['banana', 'apple'], 'pear', 'orange');
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

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