From 9d063f40ef6f0c27dec6d4f63590e69c5722ba6e Mon Sep 17 00:00:00 2001
From: Hans Bhatia <h23bhati@uwaterloo.ca>
Date: Tue, 27 Jun 2023 12:39:33 -0400
Subject: [PATCH 1/3] docs(counter): add doc + summary

---
 src/SUMMARY.md         |  3 ++-
 src/ch00-11-counter.md | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 src/ch00-11-counter.md

diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 113a2061..869aa2e1 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -13,7 +13,8 @@ Summary
   - [Function Attributes](./ch00-08-function_attributes.md)
   - [If statements](./ch00-09-if_statements.md)
   - [Events](./ch00-10-events.md)
+  - [Counter](./ch00-11-counter.md)
 
 - [Applications](./ch01-00-applications.md)
   - [Upgradeable Contract](./ch01-01-upgradeable_contract.md)
-  - [Defi Vault](./ch01-02-simple_vault.md)
\ No newline at end of file
+  - [Defi Vault](./ch01-02-simple_vault.md)
diff --git a/src/ch00-11-counter.md b/src/ch00-11-counter.md
new file mode 100644
index 00000000..7ad35c70
--- /dev/null
+++ b/src/ch00-11-counter.md
@@ -0,0 +1,14 @@
+# Simple Counter
+
+This is the Cairo adaptation of the [Solidity by example First Application](https://solidity-by-example.org/first-app/).
+Here's how it works:
+
+- The contract has a state variable called 'counter' that is initialized to 0.
+
+- When a user calls 'increment', the contract increments the counter by 1.
+
+- When a user calls 'decrement', the contract decrements the counter by 1.
+
+```rust
+{{#include ../listings/ch00-introduction/counter/src/counter.cairo}}
+```

From ff366cd8fac7974c045199b7181dec845d21ebdb Mon Sep 17 00:00:00 2001
From: Hans Bhatia <h23bhati@uwaterloo.ca>
Date: Tue, 27 Jun 2023 12:59:51 -0400
Subject: [PATCH 2/3] feat(counter): add counter pkg

---
 listings/ch00-introduction/counter/.gitignore |  1 +
 listings/ch00-introduction/counter/Scarb.toml |  8 +++++++
 .../counter/src/counter.cairo                 | 24 +++++++++++++++++++
 .../ch00-introduction/counter/src/lib.cairo   |  1 +
 4 files changed, 34 insertions(+)
 create mode 100644 listings/ch00-introduction/counter/.gitignore
 create mode 100644 listings/ch00-introduction/counter/Scarb.toml
 create mode 100644 listings/ch00-introduction/counter/src/counter.cairo
 create mode 100644 listings/ch00-introduction/counter/src/lib.cairo

diff --git a/listings/ch00-introduction/counter/.gitignore b/listings/ch00-introduction/counter/.gitignore
new file mode 100644
index 00000000..eb5a316c
--- /dev/null
+++ b/listings/ch00-introduction/counter/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/listings/ch00-introduction/counter/Scarb.toml b/listings/ch00-introduction/counter/Scarb.toml
new file mode 100644
index 00000000..2e5938be
--- /dev/null
+++ b/listings/ch00-introduction/counter/Scarb.toml
@@ -0,0 +1,8 @@
+[package]
+name = "counter"
+version = "0.1.0"
+
+[dependencies]
+starknet = "1.1.0"
+
+[[target.starknet-contract]]
diff --git a/listings/ch00-introduction/counter/src/counter.cairo b/listings/ch00-introduction/counter/src/counter.cairo
new file mode 100644
index 00000000..e230fb8e
--- /dev/null
+++ b/listings/ch00-introduction/counter/src/counter.cairo
@@ -0,0 +1,24 @@
+#[contract]
+mod SimpleCounter {
+    struct Storage {
+        // Counter variable
+        _counter: u256,
+    }
+
+    #[constructor]
+    fn constructor() {}
+
+    #[external]
+    fn increment() {
+        // Store counter value + 1
+        let counter: u256 = _counter::read() + 1;
+        _counter::write(counter);
+    }
+
+    #[external]
+    fn decrement() {
+        // Store counter value - 1
+        let counter: u256 = _counter::read() - 1;
+        _counter::write(counter);
+    }
+}
diff --git a/listings/ch00-introduction/counter/src/lib.cairo b/listings/ch00-introduction/counter/src/lib.cairo
new file mode 100644
index 00000000..ba8e24da
--- /dev/null
+++ b/listings/ch00-introduction/counter/src/lib.cairo
@@ -0,0 +1 @@
+mod counter;
\ No newline at end of file

From 9d44e1dfa45afbd9e097be8d897fa020590af704 Mon Sep 17 00:00:00 2001
From: Hans Bhatia <h23bhati@uwaterloo.ca>
Date: Tue, 27 Jun 2023 16:45:46 -0400
Subject: [PATCH 3/3] fix(counter): address pr review changes

---
 listings/ch00-introduction/counter/src/counter.cairo | 5 +++++
 src/ch00-11-counter.md                               | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/listings/ch00-introduction/counter/src/counter.cairo b/listings/ch00-introduction/counter/src/counter.cairo
index e230fb8e..822965ce 100644
--- a/listings/ch00-introduction/counter/src/counter.cairo
+++ b/listings/ch00-introduction/counter/src/counter.cairo
@@ -8,6 +8,11 @@ mod SimpleCounter {
     #[constructor]
     fn constructor() {}
 
+    #[view]
+    fn get_current_count() -> u256 {
+        return _counter::read();
+    }
+
     #[external]
     fn increment() {
         // Store counter value + 1
diff --git a/src/ch00-11-counter.md b/src/ch00-11-counter.md
index 7ad35c70..b67017c2 100644
--- a/src/ch00-11-counter.md
+++ b/src/ch00-11-counter.md
@@ -1,6 +1,7 @@
 # Simple Counter
 
-This is the Cairo adaptation of the [Solidity by example First Application](https://solidity-by-example.org/first-app/).
+This is a smiple counter contract.
+
 Here's how it works:
 
 - The contract has a state variable called 'counter' that is initialized to 0.