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Checking for a Doubleton Number in JavaScript
Doubleton Number
We will call a natural number a "doubleton number" if it contains exactly two distinct digits. For example, 23, 35, 100, 12121 are doubleton numbers, and 123 and 9980 are not.
Problem
We are required to write a JavaScript function that takes in a number and return true if it is a doubleton number, false otherwise.
Example
Following is the code −
const num = 121212;
const isDoubleTon = (num = 1) => {
const str = String(num);
const map = {};
for(let i = 0; i < str.length; i++){
const el = str[i];
if(!map.hasOwnProperty(el)){
map[el] = true;
};
};
const props = Object.keys(map).length;
return props === 2;
};
console.log(isDoubleTon(num));Output
Following is the console output −
true
Updated on: 17-Apr-2021
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