Count and CountCmp added

count.go

@@ -0,0 +1,15 @@
+package slices
+
+func Count[T comparable](slice []T, value T) int {
+	return CountCmp(slice, value, DefaultEqualityComparator[T])
+}
+
+func CountCmp[T comparable](slice []T, value T, cmp EqualityComparator[T]) int {
+	c := 0
+	for _, v := range slice {
+		if cmp(v, value) {
+			c++
+		}
+	}
+	return c
+}