1 files changed, 37 insertions, 0 deletions
diff --git a/missing.go b/missing.go
new file mode 100644
index 0000000..92f92aa
--- /dev/null
+++ b/missing.go
@@ -0,0 +1,37 @@
+package badtudexo
+
+import (
+	st "saggytrousers"
+)
+
+type MissingValue[T any] struct {
+	Value	T
+	Index	int
+}
+
+func MissingValueNew[T any](value T, index int) MissingValue[T] {
+	return MissingValue[T]{ value, index }
+}
+
+// Iterates through `check`, and returns all that are _not_ present in `src`, returning both the index in the array, and the value itself.
+func Missing[T comparable](check, src []T) []MissingValue[T] {
+	var missing []MissingValue[T]
+	for i, v := range check {
+		if !st.InSlice(src, v) {
+			mv := MissingValueNew(v, i)
+			missing = append(missing, mv)
+		}
+	}
+
+	return missing
+}
+
+// Iterates through `src`, and returns whether all are present in `check`.
+func Present[T comparable](check, src []T) bool {
+	for _, v := range src {
+		if !st.InSlice(check, v) {
+			return false
+		}
+	}
+	return true
+}