Added tutorial 23

Author: willitscale

README.md

@@ -25,6 +25,7 @@ The companion to the Youtube tutorials
 - [Learning Solidity : Tutorial 20 Parameter Mapping and Multiple Return Values](https://www.youtube.com/watch?v=v3aoiTh-UVQ)
 - [Learning Solidity : Tutorial 21 Truffle, Atom and TestRPC](https://www.youtube.com/watch?v=YcTSilIfih0)
 - [Learning Solidity : Tutorial 22 Developing an ICO/Crowdsale with TDD](https://www.youtube.com/watch?v=Cow_aL7NUGY)
+- [Learning Solidity : Tutorial 23 State Modifiers](https://www.youtube.com/watch?v=RKos31UueqY)
 
 ### Support
 

tutorial-23/StateModifiers.sol

@@ -0,0 +1,23 @@
+pragma solidity ^0.4.0;
+
+contract StateModifiers {
+    uint private constant varConstantValue = 55;
+    uint private stateValue;
+    
+    function stateAccess() public returns (uint) {
+        stateValue = 10;
+        return stateValue;
+    }
+    
+    function constantAccess() public constant returns (uint) {
+        return block.number;
+    }
+    
+    function viewAccess() public view returns (uint) {
+        return stateValue;
+    }
+    
+    function pureAccess() public pure returns (uint) {
+        return varConstantValue;
+    }
+}