initial checkin

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

string/string.go

@@ -0,0 +1,49 @@
+package string
+
+import (
+	"strings"
+
+	F "github.com/ibm/fp-go/function"
+	O "github.com/ibm/fp-go/ord"
+)
+
+var (
+	// ToUpperCase converts the string to uppercase
+	ToUpperCase = strings.ToUpper
+
+	// ToLowerCase converts the string to lowercase
+	ToLowerCase = strings.ToLower
+
+	// Ord implements the default ordering for strings
+	Ord = O.FromStrictCompare[string]()
+)
+
+func Eq(left string, right string) bool {
+	return left == right
+}
+
+func ToBytes(s string) []byte {
+	return []byte(s)
+}
+
+func IsEmpty(s string) bool {
+	return len(s) == 0
+}
+
+func IsNonEmpty(s string) bool {
+	return len(s) > 0
+}
+
+func Size(s string) int {
+	return len(s)
+}
+
+// Includes returns a predicate that tests for the existence of the search string
+func Includes(searchString string) func(string) bool {
+	return F.Bind2nd(strings.Contains, searchString)
+}
+
+// Equals returns a predicate that tests if a string is equal
+func Equals(other string) func(string) bool {
+	return F.Bind2nd(Eq, other)
+}