package q5

func Map[T any](arr []T, cb func(T) T) []T {
	newList := []T{}
	for _, val := range arr {
		newList = append(newList, cb(val))
	}
	return newList
}

func Reduce[T any](arr []T, cb func(T, T) T, initVal *T) T {
	var result T
	if initVal != nil {
		result = *initVal
	}
	if len(arr) > 0 {
		if initVal == nil {
			result = arr[0]
			for i := 1; i < len(arr); i++ {
				result = cb(result, arr[i])
			}
		} else {
			for i := 0; i < len(arr); i++ {
				result = cb(result, arr[i])
			}
		}
	}
	return result
}

func Filter[T any](arr []T, cb func(T) bool) []T {
	newList := []T{}
	for _, val := range arr {
		if cb(val) {
			newList = append(newList, val)
		}
	}
	return newList
}

func Max[T string | int | int32 | int64 | float32 | float64](a T, b T) T {
	if a < b {
		return b
	} else {
		return a
	}
}

func Min[T string | int | int32 | int64 | float32 | float64](a T, b T) T {
	if a < b {
		return a
	} else {
		return b
	}
}

func ToInterfaces[T any](values []T) []interface{} {
	result := []interface{}{}
	for _, val := range values {
		result = append(result, val)
	}
	return result
}