Initial Commit

contracts/SimpleStorage.sol

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.24;
+
+contract SimpleStorage {
+    // boolean, uint, int, address, bytes
+    address myAddress = 0xc9445E993dAeA4bA3F1FE1080F0F6f8c46b4d967;
+    uint256 public myNumber = 123; // With Getter, Retrieval Need Gas
+    string myText = "Hello World";
+    //int256 favoriteInt = -5;
+    //bytes32 favoriteBytes = "cat";
+    uint256 myDefaultZero; // Initialize default to 0
+
+    // Paid
+    function storeMyNumber(uint256 _favariteNumber) public virtual {
+        myNumber = _favariteNumber;
+        //retrieve();
+    }
+
+    /*
+        view - for retrieve variable data (Free)
+        pure - for calculation (Free)
+        Free function will cost $ if call in Paid function
+    */
+    function viewMyNumber() public view returns (uint256) {
+        return myNumber;
+    }
+
+    function pureCalculation() public pure returns (uint256) {
+        return ((1 + 555) * 22) / 88;
+    }
+
+    // Custom People Object
+    struct People {
+        uint256 favoriteNumber;
+        string name;
+    }
+
+    People public personJohn = People({favoriteNumber: 2, name: "John"});
+
+    // Array Variable
+    People[] public people;
+
+    function addNewPerson2(
+        string memory _name,
+        uint256 _favoriteNumber
+    ) public {
+        //People memory newPerson = People(_favoriteNumber, _name);
+        people.push(People(_favoriteNumber, _name));
+        nameToFavoriteNumber[_name] = _favoriteNumber;
+    }
+
+    /*
+    calldata - tmp data cannot modify
+    memory - tmp dta can modify
+    storage - permanent data can modify
+    */
+
+    // Mapping - Easy to find data (Like Java HashMap)
+    mapping(string => uint256) public nameToFavoriteNumber;
+
+    /*
+    EVM, Ethereum Virtual Machine
+    Avalanche, Fantom, Polygon
+    */
+}