combine many operator

CombieSwiftUI/CombieSwiftUI.xcodeproj/project.pbxproj

@@ -15,6 +15,7 @@
 		1D3692CB283B905000B4494D /* extension + ContentView + 2.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1D3692CA283B904F00B4494D /* extension + ContentView + 2.swift */; };
 		1D3692CD283B90E100B4494D /* chapter3 + Operators.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1D3692CC283B90E100B4494D /* chapter3 + Operators.swift */; };
 		1D3692D0283BA26400B4494D /* Chatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1D3692CF283BA26400B4494D /* Chatter.swift */; };
+		1D3692D2283BF88400B4494D /* chapter4 + Filtering operator .swift in Sources */ = {isa = PBXBuildFile; fileRef = 1D3692D1283BF88400B4494D /* chapter4 + Filtering operator .swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -27,6 +28,7 @@
 		1D3692CA283B904F00B4494D /* extension + ContentView + 2.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "extension + ContentView + 2.swift"; sourceTree = "<group>"; };
 		1D3692CC283B90E100B4494D /* chapter3 + Operators.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "chapter3 + Operators.swift"; sourceTree = "<group>"; };
 		1D3692CF283BA26400B4494D /* Chatter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Chatter.swift; sourceTree = "<group>"; };
+		1D3692D1283BF88400B4494D /* chapter4 + Filtering operator .swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "chapter4 + Filtering operator .swift"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -104,6 +106,7 @@
 		1D3692BB283A164E00B4494D /* chapter4 */ = {
 			isa = PBXGroup;
 			children = (
+				1D3692D1283BF88400B4494D /* chapter4 + Filtering operator .swift */,
 			);
 			path = chapter4;
 			sourceTree = "<group>";
@@ -256,6 +259,7 @@
 				1D3692CD283B90E100B4494D /* chapter3 + Operators.swift in Sources */,
 				1D3692AA283A157000B4494D /* ContentView.swift in Sources */,
 				1D3692CB283B905000B4494D /* extension + ContentView + 2.swift in Sources */,
+				1D3692D2283BF88400B4494D /* chapter4 + Filtering operator .swift in Sources */,
 				1D3692A8283A157000B4494D /* CombieSwiftUIApp.swift in Sources */,
 				1D3692C6283A178000B4494D /* SupportCode.swift in Sources */,
 				1D3692D0283BA26400B4494D /* Chatter.swift in Sources */,

CombieSwiftUI/CombieSwiftUI/Chapters/chapter3/chapter3 + Operators.swift

@@ -9,11 +9,11 @@ import Foundation
 import Combine
 
 extension ContentView{
-
+    
     func collectingValues(){
 
         var subscriptions = Set<AnyCancellable>()
-        
+
         SupportCode.example(of: "Collect") {
             ["A", "B", "C", "D", "E"].publisher
                 .collect(2)
@@ -51,7 +51,7 @@ extension ContentView{
         print("\n---------> tryMap <---------")
         var subscriptions = Set<AnyCancellable>()
 
-         Just("Directory name that does not exist")
+        Just("Directory name that does not exist")
 
             .tryMap { values in
                 try FileManager.default.contentsOfDirectory(atPath: values)
@@ -75,7 +75,7 @@ extension ContentView{
         chat_one.message.value = "How's it going?"
 
         chat.value = chat_two
-            
+
         chat
             .flatMap{ $0.message }
             .sink { chats in
@@ -84,4 +84,21 @@ extension ContentView{
             .store(in: &subscriptions)
 
     }
+
+    func ReplacingUpstreamOutput(){
+        print("\n---------> Replacing upstream output <---------")
+
+        SupportCode.example(of: "Replacing upstream output") {
+            var subscriptions = Set<AnyCancellable>()
+
+            let replace =   ["A", nil, "C"].publisher
+
+            replace
+                .replaceNil(with: "-")
+                .map{ $0!}
+                .sink { item in
+                    print(item)
+                }.store(in: &subscriptions)
+        }
+    }
 }

CombieSwiftUI/CombieSwiftUI/Chapters/chapter4/chapter4 + Filtering operator .swift

@@ -0,0 +1,72 @@
+//
+//  chapter4 + Filtering operator .swift
+//  CombieSwiftUI
+//
+//  Created by Imran on 23/5/22.
+//
+
+import Foundation
+import Combine
+
+extension ContentView{
+
+    func filterBasic(){
+        SupportCode.example(of: "Filter Basic") {
+            var subscriptions = Set<AnyCancellable>()
+
+            let numbers = (1...100).publisher
+            numbers
+                .filter { $0.isMultiple(of: 3)}
+                .sink { item in
+                    print(item)
+                }
+                .store(in: &subscriptions)
+        }
+    }
+
+    func removeDuplicates(){
+        SupportCode.example(of: "Remove Duplicates") {
+            var subscriptions = Set<AnyCancellable>()
+
+            let words = "hey hey there! want to listen to mister mister ha ha ha ha ?".components(separatedBy: " ").publisher
+
+            words
+                .removeDuplicates()
+//                .map{ $0 }
+                .sink { item in
+                    print(item )
+                }.store(in: &subscriptions)
+        }
+    }
+
+    func conpactMapValues(){
+        SupportCode.example(of: "Compact Map") {
+            var subscriptios = Set<AnyCancellable>()
+
+            let stringValues = [" ", "", "", "", "", "i"].publisher
+
+            stringValues
+                .compactMap{  ($0) }
+                .sink { item in
+                    print(item)
+                }
+                .store(in: &subscriptios)
+        }
+    }
+
+    func ignoreOutpuValues(){
+        SupportCode.example(of: "IgnoreOutput") {
+            var subscribes = Set<AnyCancellable>()
+            let numbersValues = (1...10_000).publisher
+
+            numbersValues
+                .ignoreOutput()
+                .sink { errors in
+                    print("Compled with: \(errors)")
+                } receiveValue: { item in
+                 print(item)
+                }
+                .store(in: &subscribes)
+        }
+    }
+}

CombieSwiftUI/CombieSwiftUI/ContentView.swift

@@ -21,6 +21,14 @@ struct ContentView: View {
         mappingValue()
         tryMapValue()
         flatMapValues()
+        ReplacingUpstreamOutput()
+
+        print("\n---------> Chapter 4: Filtring Operators <---------")
+
+        filterBasic()
+        removeDuplicates()
+        conpactMapValues()
+        ignoreOutpuValues()
     }