Add JsonPrint, StringMissing

strings.go

@@ -6,6 +6,8 @@ import (
 
 	"golang.org/x/text/cases"
 	"golang.org/x/text/language"
+
+	"github.com/sergi/go-diff/diffmatchpatch"
 )
 
 var caserTitle cases.Caser = cases.Title(language.English, cases.NoLower)
@@ -32,3 +34,19 @@ func StringIsBlank(s string) bool {
 func StringIsNotBlank(s string) bool {
   return !StringIsBlank(s)
 }
+
+
+func StringMissing(a, b string) string {
+	dmp := diffmatchpatch.New()
+  diffs := dmp.DiffMain(a, b, false)
+
+  var missing string
+
+  for _, d := range diffs {
+    if d.Type == diffmatchpatch.DiffDelete {
+      missing += d.Text
+    }
+  }
+
+  return missing
+}