JavaScript: Check an integer is Repdigit number or not

Last update on April 22 2023 12:19:10 (UTC/GMT +8 hours)

JavaScript Math: Exercise-80 with Solution

Write a JavaScript program to check whether a given integer is a Repdigit or not.

From Wikipedia -
In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word is a portmanteau of repeated and digit. Examples are 11, 666, 4444, and 999999.

Test Data:
(11) -> true
(66) -> true
(336) -> false
(444) -> true
(1151) -> false

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript program to check an integer is Repdigit number or not</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function test(n) {
	return new Set('' + n).size === 1
}

n = 11
console.log("n = "+n)
console.log("Check the said number is Repdigit: "+test(n));
n = 66
console.log("n = "+n)
console.log("Check the said number is Repdigit: "+test(n));
n = 336
console.log("n = "+n)
console.log("Check the said number is Repdigit: "+test(n));
n = 444
console.log("n = "+n)
console.log("Check the said number is Repdigit: "+test(n));
n = 1151
console.log("n = "+n)
console.log("Check the said number is Repdigit: "+test(n));

Sample Output:

n = 11
Check the said number is Repdigit: true
n = 66
Check the said number is Repdigit: true
n = 336
Check the said number is Repdigit: false
n = 444
Check the said number is Repdigit: true
n = 1151
Check the said number is Repdigit: false

Flowchart:

$JavaScript: Check an integer is Repdigit number or not.$

Live Demo:

See the Pen javascript-math-exercise-80 by w3resource (@w3resource) on CodePen.

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