How do I sort a slice of ints by the first digit of each int?
I am trying to write my own custom sort:
type ByFirstDigit []int
func (s ByFirstDigit) Len() int {
return len(s)
}
func (s ByFirstDigit) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s ByFirstDigit) Less(i, j int) bool {
return s[i][0] < s[j][0]
}
But I get this error:
s[j][0] (type int does not support indexing)