more helper functions

to.go

@@ -0,0 +1,42 @@
+package slices
+
+import (
+	"container/list"
+)
+
+// Deref returns a slice containing all dereferenced values of s.
+// The returned slice will be a dereferenced and continuous block of memory.
+// Nil pointers are ignored.
+func Deref[T any](s []*T) []T {
+	out := make([]T, 0, len(s))
+	Each(s, func(v *T) {
+		if v != nil {
+			out = append(out, *v)
+		}
+	})
+	return out
+}
+
+// ToList returns a list.List containing all values of s
+func ToList[T any](s []T) *list.List {
+	l := list.New()
+	Each(s, func(value T) { l.PushBack(value) })
+	return l
+}
+
+// ToMap returns a map containing all values of s.
+// The map key-value pairs are determined by mapper
+func ToMap[T any, K comparable, V any](s []T, mapper func(T) (K, V)) map[K]V {
+	m := map[K]V{}
+	Each(s, func(value T) {
+		k, v := mapper(value)
+		m[k] = v
+	})
+	return m
+}
+
+// ToStructMap returns a struct{} map containing all values of s as keys.
+// It is a shorthand for ToMap(s, func(value T) (T, struct{}) { return value, struct{}{} })
+func ToStructMap[T comparable](s []T) map[T]struct{} {
+	return ToMap(s, func(value T) (T, struct{}) { return value, struct{}{} })
+}