Feat constructor

listings/ch00-introduction/constructor/.gitignore

@@ -0,0 +1 @@
+target

listings/ch00-introduction/constructor/Scarb.toml

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+[package]
+name = "constructor"
+version = "0.1.0"
+
+# See more keys and their definitions at https://docs.swmansion.com/scarb/docs/reference/manifest
+
+[dependencies]
+starknet = "1.1.0"
+
+[[target.starknet-contract]]

listings/ch00-introduction/constructor/src/lib.cairo

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+#[contract]
+mod constructor {
+    use starknet::ContractAddress;
+
+    struct Storage {
+        _names: LegacyMap::<ContractAddress, felt252>, 
+    }
+
+    #[constructor]
+    fn constructor(name: felt252, address: ContractAddress) {
+        _names::write(address, name);
+    }
+}

src/SUMMARY.md

@@ -8,6 +8,7 @@ Summary
   - [Write to Any Slot](./ch00-04-write_to_any_slot.md)
   - [Storing Arrays](./ch00-05-storing_arrays.md)
   - [Mappings](./ch00-06-mappings.md)
+  - [Constructors](./ch00-07-constructor.md)
 
 - [Applications](./ch01-00-applications.md)
   - [Upgradeable Contract](./ch01-01-upgradeable_contract.md)

src/ch00-07-constructor.md

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+# Constructor
+
+Constructors are a special type of function that runs only once when deploying a contract, and can be used to initialize the state of the contract. Your contract must not have more than one constructor, and that constructor function must be annotated with the `#[constructor]` attribute. Also, a good practice consists in naming that function `constructor`.
+
+Here's a simple example that demonstrates how to initialize the state of a contract on deployment by defining logic inside a constructor.
+
+```rust
+{{#include ../listings/ch00-introduction/constructor/src/lib.cairo}}
+```