AlgoDaily - Power of Three

Power of Three (Easy)

Good evening! Here's our prompt for today.

You may see this problem at Cisco, Autodesk, Vmware, Groupon, Flatiron Health, and Segment.

Given an integer num, write a method to determine if it is a power of 3.

The method will be called as follows:

JAVASCRIPT

1console.log(powerOfThree(9));
2// true
3
4console.log(powerOfThree(7));
5// false

Constraints

The given would be a non zero positive integer in the range between 1 and 2147483647
Expected space complexity : O(logn)
Expected time complexity : O(1)

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​
 
var assert = require('assert');
​
function powerOfThree(num) {
  // Fill in this method
  return num;
}
​
console.log(powerOfThree(9));
console.log(powerOfThree(7));
​
try {
  assert.equal(powerOfThree(9), true);
​
  console.log('PASSED: ' + 'powerOfThree(9) should be true');
} catch (err) {
  console.log(err);
}
​
try {
  assert.equal(powerOfThree(7), false);
​
  console.log('PASSED: ' + 'powerOfThree(7) should be false');
} catch (err) {
  console.log(err);
}
​
try {

OUTPUT

Results will appear here.