Validating a power JavaScript

We are required to write a JavaScript function that in a number, say n, as the only input. The function should then validate if the input number is a power of 3 or not.

If it is a power of 3, we should return true, false otherwise.

For example −

isPowerOf3(243) = true
isPowerOf3(343) = false
isPowerOf3(81) = true

Example

const num = 243;
var isPowerOf3 = (num = 3) => {
   let divisor = num === 1 ? 1 : 3; while(divisor < num){
      divisor *= 3;
   };
   return divisor === num;
};
console.log(isPowerOf3(num));
console.log(isPowerOf3(343));
console.log(isPowerOf3(81));

Output

And the output in the console will be −

true
false
true

AmitDiwan

Updated on 23-Nov-2020 07:11:00

• Related Questions & Answers
• Validating a password using JavaScript
• Validating a boggle word using JavaScript
• Validating brackets in a string in JavaScript
• Validating email and password - JavaScript
• Validating a file size in JavaScript while uploading
• Validating push pop sequence in JavaScript
• Validating a square in a 2-D plane in JavaScript
• Validating alternating vowels and consonants in JavaScript
• Validating a string with numbers present in it in JavaScript
• Finding power set for a set in JavaScript Power Set
• Nearest power 2 of a number - JavaScript
• Validating string with reference to array of words using JavaScript
• Way of validating RadioBoxes with jQuery?
• Check for Power of two in JavaScript
• Checking if a number is a valid power of 4 in JavaScript