Add basic features

Author: gin

script/Counter.s.sol

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+contract CommitmentDevice {
+    error CommitmentDevice__IndexOutOfBounds(uint256 index);
+
+    uint256 public number;
+    string[] public commitments;
+    bool[] private _hasAchieved;
+    uint256 public numberOfCommitments;
+
+    constructor() {
+        number = 0;
+        numberOfCommitments = 0;
+    }
+
+    function setNumber(uint256 newNumber) public {
+        number = newNumber;
+    }
+
+    function increment() public {
+        number++;
+    }
+
+    function addCommitment(string memory commitment) public {
+        commitments.push(commitment);
+        _hasAchieved.push(false); // Is this needed? Can remove if gas saved.
+        numberOfCommitments++;
+    }
+
+    function editCommitment(uint256 index, string memory newCommitment) public {
+        if (index < 0 || index >= numberOfCommitments) revert CommitmentDevice__IndexOutOfBounds(index);
+        commitments[index] = newCommitment;
+    }
+
+    function removeCommitment(uint256 index) public {
+        if (index < 0 || index >= numberOfCommitments) revert CommitmentDevice__IndexOutOfBounds(index);
+        commitments[index] = commitments[numberOfCommitments - 1];
+        commitments.pop();
+        _hasAchieved[index] = _hasAchieved[numberOfCommitments - 1];
+        _hasAchieved.pop();
+        numberOfCommitments--;
+    }
+
+    function _hasAchievedCommitment(uint256 index) public view returns (bool) {
+        if (index < 0 || index >= numberOfCommitments) revert CommitmentDevice__IndexOutOfBounds(index);
+        return _hasAchieved[index];
+    }
+}

src/CommitmentDevice.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import {Test, console} from "forge-std/Test.sol";
+import {CommitmentDevice} from "src/CommitmentDevice.sol";
+
+contract CounterTest is Test {
+    CommitmentDevice public c;
+
+    function setUp() public {
+        c = new CommitmentDevice();
+        // c.setNumber(0);
+    }
+
+    function test_Increment() public {
+        c.increment();
+        assertEq(c.number(), 1);
+    }
+
+    function testFuzz_SetNumber(uint256 x) public {
+        c.setNumber(x);
+        assertEq(c.number(), x);
+    }
+
+    function test_AddCommitment() public {
+        c.addCommitment("commitment1");
+        assertEq(c.numberOfCommitments(), 1);
+    }
+
+    function test_EditCommitment() public {
+        c.addCommitment("commitment1");
+        c.editCommitment(0, "commitment2");
+        assertEq(c.numberOfCommitments(), 1);
+        assertEq(c.commitments(0), "commitment2");
+    }
+
+    function test_RemoveCommitment() public {
+        c.addCommitment("commitment1");
+        c.removeCommitment(0);
+        assertEq(c.numberOfCommitments(), 0);
+    }
+}