Pascal's triangle algorithms without copying the array

pascaltriangles.go

func pascalTriangle (pascalLine []int) []int {
	if compareSlices(pascalLine, []int{1}) {
		return []int{1, 1}
	}
	for i, j := range pascalLine[:len(pascalLine)-1] {
		pascalLine[i] = j + pascalLine[i+1]
	}
	return append([]int{1}, pascalLine...)
}