Implement And filter

Author: BooleanCat

iter/filters/filters.go

@@ -18,3 +18,15 @@ func LessThan[T constraints.Ordered](t T) func(T) bool {
 		return s < t
 	}
 }
+
+func And[T constraints.Ordered](filters ...func(T) bool) func(T) bool {
+	return func(t T) bool {
+		for _, filter := range filters {
+			if !filter(t) {
+				return false
+			}
+		}
+
+		return true
+	}
+}

iter/filters/filters_test.go

@@ -22,3 +22,12 @@ func TestLessThan(t *testing.T) {
 	items := iter.Filter[int](iter.Lift([]int{1, 2, 3, 4, 5, 1}), filters.LessThan(2))
 	assert.SliceEqual(t, iter.Collect[int](items), []int{1, 1})
 }
+
+func TestAnd(t *testing.T) {
+	items := iter.Filter[int](iter.Lift([]int{1, 2, 3, 4, 5, 6, 7}), filters.And(
+		filters.GreaterThan(2),
+		filters.LessThan(7),
+	))
+
+	assert.SliceEqual(t, iter.Collect[int](items), []int{3, 4, 5, 6})
+}