DEV Community

Discussion on: Easy peasy First Odd Int

dry profile image
Hayden Mankin

Correct me if I misunderstood, but the question is to find the first integer that appears an odd number of times. Wouldn't this solution not work if there are multiple integers appearing an odd number of times?

For instance, findOddInt([1,1,2,2,2,3,3,3]) would return 1 instead of the expected value of 2.

The solution I came up with is:

const findOddInt = (array) => {
  return Object.entries(array.reduce((oddMap, element) => {
    oddMap[element] ^= true;
    return oddMap;
  }, {})).find(element => element[1])[0];
Enter fullscreen mode Exit fullscreen mode

But even this I still think the problem is somewhat unclear; Should findOddInt([1,2,2,2,1,1]) return '1' because '1' appeared initially before '2', or should it be '2' because it was the first to appear an odd number of times?

divyajyotiuk profile image
Divyajyoti Ukirde Author

Very well done! The question should be changed to only one integer occurs odd number of times