power-of-three.js

// Given an integer, write a function to determine if it is a power of three.
//
//
//     Follow up:
//     Could you do it without using any loop / recursion?
//
//
// Credits:Special thanks to @dietpepsi for adding this problem and creating all test cases.


/**
 * @param {number} n
 * @return {boolean}
 */
var isPowerOfThree = function(n) {
        switch(n) {
            case 1:
            case 3:
            case 9:
            case 27:
            case 81:
            case 243:
            case 729:
            case 2187:
            case 6561:
            case 19683:
            case 59049:
            case 177147:
            case 531441:
            case 1594323:
            case 4782969:
            case 14348907:
            case 43046721:
            case 129140163:
            case 387420489:
            case 1162261467:
                return true;
            default: return false;
        }
};