diff --git a/JString.cpp b/JString.cpp
new file mode 100644
index 0000000..f90c22b
--- /dev/null
+++ b/JString.cpp
@@ -0,0 +1,120 @@
+#include "JString.h"
+#include "Exception.h"
+
+namespace coreutils {
+
+   JString::JString() : MString("{}") {}
+
+   JString::JString(const char *data) : MString(data) {}
+
+   void JString::set(ZString path, const char *value) {
+      reset();
+      if(locate(path)) {
+         push();
+         if(ifNext("\"")) {
+            ZString old = getTokenExclude("\"");
+            pop();
+            remove(offset(), old.getLength() + 2);
+            MString key;
+            key << "\"" << value << "\"";
+            insert(key, offset());
+         } else {
+	    pop();
+	    throw coreutils::Exception("Fix me to accept integer type.");
+	 }
+      } else {
+         std::cout << "[" << unparsed() << "]" << std::endl;
+         MString key;
+     	   if(notfirst)
+           key << ",";
+         key << "\"" << path << "\":" << "\"" << value << "\"";
+         insert(key, offset());
+      }
+   }
+
+   ZString JString::find(ZString path) {
+      if(locate(path)) {
+         if(ifNext("\""))
+   	     return getTokenExclude("\"");
+         if(startsWith("[")) {
+            ZString temp = getContainer();
+            std::cout << temp << std::endl;
+         }
+      }
+      return ZString();
+   }
+
+   void JString::operator=(ZString &value) {
+   }
+
+   JString& JString::operator=(const char *value) {
+      std::cout << "operator=" << value << "\n";
+      set(path, value);
+      return *this;
+   }
+
+   // ZString JString::operator[](const char *path) {
+   //    std::cout << "operator[" << path << "]\n";
+   //    this->path = path;
+   //    reset();
+   //    return find(path);
+   // }
+
+  JString& JString::operator[](const char *path) {
+     std::cout << "operator[" << path << "]\n";
+     reset();
+     this->path = path;
+     find(path);
+     return *this;
+  }
+
+   bool JString::locate(ZString path) {
+      path.split(".", 1);
+      notfirst = false;
+      if(ifNext("{")) {
+         while(startsWith("\"")) {
+	    notfirst = true;
+            ZString label;
+            ZString value;
+            if(ifNext("\"")) {
+               label = getTokenExclude("\"");
+               ifNext("\"");
+            }  else
+              throw coreutils::Exception("Labels must be contained in double quotes.");
+            if(ifNext(":")) {
+               if(label == path[0]) {
+                  if(path.getList().size() == 1)
+                    return true;
+                  return locate(path[1]);
+               } if(startsWith("\"")) {
+                  getContainer();;
+	            } else if(startsWith("[")) {
+                  getContainer();
+               } else {
+                  throw coreutils::Exception("Unrecognized data type.");
+               }
+               ifNext(",");
+            } else
+              throw coreutils::Exception("Expected colon after label.");
+         }
+      } else if(ifNext("[")) {
+         ZString label = path[0].getTokenExclude("[");
+         path[0].ifNext("[");
+         ZString key = path[0].getTokenExclude("=");
+         path[0].ifNext("=");
+         ZString value = path[0].getTokenExclude("]");
+         while(!ifNext("]")) {
+            push();
+            ZString check = find(key);
+            pop();
+            if(check.equals(value)) {
+               return locate(label);
+            } else {
+               getContainer();
+               ifNext(",");
+            }
+         }
+      }
+      return false;
+   }
+}
diff --git a/testing/jstring_test b/testing/jstring_test
new file mode 100755
index 0000000..359d168
Binary files /dev/null and b/testing/jstring_test differ
diff --git a/testing/jstring_test.cpp b/testing/jstring_test.cpp
new file mode 100644
index 0000000..3794bbd
--- /dev/null
+++ b/testing/jstring_test.cpp
@@ -0,0 +1,33 @@
+#include <iostream>
+#include "../JString.h"
+
+int main(int argc, char **argv) {
+
+   // coreutils::JString test1;
+   // std::cout << "empty jstring: [" << test1 << "]." << std::endl;
+   // test1.set("key1", "data1");
+   // std::cout << "add key1 jstring: [" << test1 << "]." << std::endl;
+   // test1.set("key2", "data2");
+   // std::cout << "add key2 jstring: [" << test1 << "]." << std::endl;
+   // test1.set("key3", "data3");
+   // std::cout << test1["key1"] << test1["key2"] << test1["key3"] << std::endl;
+   // std::cout << test1 << std::endl;
+   // test1.set("key2", "data5");
+   // test1.set("key4", "data4");
+   // std::cout << test1 << std::endl;
+
+   coreutils::JString test2("{\"key1\":[{\"id\":\"1\",\"name\":\"Brad\"},{\"id\":\"2\",\"name\":\"Jenn\"},{\"id\":\"3\",\"name\":\"Skye\"}],\"key2\":\"data5\",\"key3\":\"data3\",\"key4\":\"data4\"}");
+
+   // std::cout << test2["key2"] << std::endl;
+   // std::cout << test2["key1"] << std::endl;
+   // std::cout << "value: " << test2["key1.name[id=2]"] << std::endl;
+   // std::cout << "value: " << test2["key1.name[id=3]"] << std::endl;
+
+   test2["key2"] = "newvalue1";
+   std::cout << test2["key2"] << std::endl;
+   // test2 = "newvalue";
+    std::cout << test2 << std::endl;
+
+   return 0;
+}
+
diff --git a/testing/testshadow b/testing/testshadow
new file mode 100755
index 0000000..f9b6d85
Binary files /dev/null and b/testing/testshadow differ
diff --git a/testing/testshadow.cpp b/testing/testshadow.cpp
new file mode 100644
index 0000000..a03d7d1
--- /dev/null
+++ b/testing/testshadow.cpp
@@ -0,0 +1,70 @@
+#include <iostream>
+#include <cstddef>
+
+using namespace std;
+
+struct proxy_obj;
+
+struct my_bit_array
+{
+
+       uint8_t bit_array_;
+
+       proxy_obj operator[](int n);
+}
+;
+
+struct proxy_obj
+{
+
+       my_bit_array& my_bit_array_;
+       int n_;
+
+       proxy_obj(my_bit_array& bit_array, int n)
+     : my_bit_array_(bit_array), n_(n) 
+       {
+       }
+
+
+       proxy_obj& operator=(bool b)
+     {
+
+	        uint8_t set_mask = 0x01 << n_;
+
+	        if(b) my_bit_array_.bit_array_ |= set_mask;
+	        else  my_bit_array_.bit_array_ &= (~set_mask);
+
+	        return *this;
+     }
+
+
+       operator bool()
+     {
+	 return my_bit_array_.bit_array_ & (0x01 << n_); 
+     }
+
+}
+;
+
+proxy_obj my_bit_array::operator[](int n)
+{
+
+       return proxy_obj(*this, n);
+}
+
+
+int main() 
+{
+
+       my_bit_array bit_set;
+
+       bit_set[0] = false;
+       bool b = bit_set[0];
+       cout << b << endl;
+
+       bit_set[3] = true;
+       b = bit_set[3];
+       cout << b << endl;
+
+       return 0;
+}