Cat years, Dog years.js

/* Kata Task
I have a cat and a dog.

I got them at the same time as kitten/puppy. That was humanYears years ago.

Return their respective ages now as [humanYears,catYears,dogYears]

NOTES:

humanYears >= 1
humanYears are whole numbers only
Cat Years
15 cat years for first year
+9 cat years for second year
+4 cat years for each year after that
Dog Years
15 dog years for first year
+9 dog years for second year
+5 dog years for each year after that */

var humanYearsCatYearsDogYears = function(hy) {
  if(hy === 1){
    return[1,15,15]
  }else if(hy === 2){
    return[2,24,24]
  }else{
    return[hy,24 + (hy-2)*4, 24 + (hy-2)*5]
  }
}