From de6dc2e5b0d09d8f443df52febc9b8b47b4c3502 Mon Sep 17 00:00:00 2001
From: Gary Gan <gan.fang.yi@foxmail.com>
Date: Fri, 31 Jan 2025 09:27:46 +0800
Subject: [PATCH] finish protocols

---
 Protocols.playground/Contents.swift           | 115 ++++++++++++++++++
 Protocols.playground/contents.xcplayground    |   2 +
 .../contents.xcworkspacedata                  |   3 +
 3 files changed, 120 insertions(+)
 create mode 100644 Protocols.playground/Contents.swift
 create mode 100644 Protocols.playground/contents.xcplayground

diff --git a/Protocols.playground/Contents.swift b/Protocols.playground/Contents.swift
new file mode 100644
index 0000000..9da2941
--- /dev/null
+++ b/Protocols.playground/Contents.swift
@@ -0,0 +1,115 @@
+import Foundation
+
+
+protocol CanBreathe {
+    func breathe()
+}
+
+struct Animals: CanBreathe {
+    func breathe() {
+        "Animal Breathing..."
+    }
+}
+
+struct Person: CanBreathe {
+    func breathe() {
+        "Person breathing"
+    }
+}
+
+let dog = Animals()
+dog.breathe()
+let foo = Person()
+foo.breathe()
+
+
+protocol CanJump {
+    func jump()
+}
+
+extension CanJump {
+    func jump() {
+        "Jumping..."
+    }
+}
+
+struct Cat: CanJump {
+    func jump() {
+        "Cat can jump..."
+    }
+}
+
+let cat = Cat()
+cat.jump()
+
+protocol HasName {
+    var name: String { get }
+    var age: Int { get set }
+}
+
+extension HasName {
+    func describeMe() {
+        "Your name is \(name) and you are \(age) years old"
+    }
+    
+    mutating func increaseAge() {
+        self.age += 1
+    }
+}
+
+struct Dog: HasName {
+    let name: String
+    var age: Int
+}
+
+var woof = Dog(name: "Woof", age: 10)
+woof.name
+woof.age
+woof.increaseAge()
+woof.age
+woof.describeMe()
+
+
+protocol Vehicle {
+    var speed: Int { get set }
+    mutating func increaseSpeed(by value: Int)
+}
+
+extension Vehicle {
+    mutating func increaseSpeed(by value: Int) {
+        self.speed += value
+    }
+}
+
+struct Bike: Vehicle {
+    var speed: Int = 0
+}
+
+var bike = Bike()
+bike.speed
+bike.increaseSpeed(by: 40)
+bike.speed
+
+func describe(obj: Any) {
+    if obj is Vehicle {
+        "Yes"
+    } else {
+        "No"
+    }
+}
+
+describe(obj: bike)
+
+func increaseSpeedIfVehicle(obj: Any) {
+    if var vechile = obj as? Vehicle {
+        vechile.speed
+        vechile.increaseSpeed(by: 10)
+        vechile.speed
+    } else {
+        "something else"
+    }
+}
+
+increaseSpeedIfVehicle(obj: bike)
+bike.speed // 40 struct is a copy type
+
diff --git a/Protocols.playground/contents.xcplayground b/Protocols.playground/contents.xcplayground
new file mode 100644
index 0000000..10de914
--- /dev/null
+++ b/Protocols.playground/contents.xcplayground
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='7.0' target-platform='macos' swift-version='6' buildActiveScheme='true' executeOnSourceChanges='true' importAppTypes='true'/>
\ No newline at end of file
diff --git a/swift-playground.xcworkspace/contents.xcworkspacedata b/swift-playground.xcworkspace/contents.xcworkspacedata
index acdfada..90ecb82 100644
--- a/swift-playground.xcworkspace/contents.xcworkspacedata
+++ b/swift-playground.xcworkspace/contents.xcworkspacedata
@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Workspace
    version = "1.0">
+   <FileRef
+      location = "group:Protocols.playground">
+   </FileRef>
    <FileRef
       location = "group:Classes.playground">
    </FileRef>