Add FlatScan(First/Latest) operators

CHANGELOG.md

@@ -9,6 +9,7 @@ Changelog
 - removed `flatMapSync` operator
 - added `apply` for `Completable` and `Maybe` 
 - added `mapTo` for `Single` and `Maybe`
+- added `flatScan`, `flatScanFirst` and `flatScanLatest` operators
 - added SPM support
 
 5.0.0

Playground/RxSwiftExtPlayground.playground/Pages/Index.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExt (playground)` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 /*:

Playground/RxSwiftExtPlayground.playground/Pages/apply.xcplaygroundpage/Contents.swift

@@ -1,9 +1,9 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
+ 
  1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
  1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
  1. Choose `View > Show Debug Area`
  */
 

Playground/RxSwiftExtPlayground.playground/Pages/bufferWithTrigger.xcplaygroundpage/Contents.swift

@@ -1,6 +1,6 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
+ 
  1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
  1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
  1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target

Playground/RxSwiftExtPlayground.playground/Pages/cascade.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/catchErrorJustComplete.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/distinct.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/filterMap.xcplaygroundpage/Contents.swift

@@ -1,11 +1,11 @@
 /*:
-> # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExt (playground)` scheme for a simulator target
-1. Choose `View > Show Debug Area`
-*/
+ > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
+ 
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
+ */
 
 //: [Previous](@previous)
 

Playground/RxSwiftExtPlayground.playground/Pages/flatScan.xcplaygroundpage/Contents.swift

@@ -0,0 +1,68 @@
+/*:
+ > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
+
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
+ */
+
+//: [Previous](@previous)
+
+import RxSwift
+import RxSwiftExt
+
+/*:
+## flatScan()
+
+ Sometimes you need s kind of flatMap that reuse its previous element and accumulate it with the new element. For example a common pattern is to reuse the previous API response to prepare next request with current offset.
+ */
+
+struct ChunckedResource {
+    let elements: [Int]
+    let start: Int
+    let totalCount: Int
+
+    init(elements: [Int] = [], start: Int = 0, totalCount: Int = 0) {
+        self.elements = elements
+        self.start = start
+        self.totalCount = totalCount
+    }
+
+    func merging(with other: ChunckedResource) -> ChunckedResource {
+        guard other.start <= elements.count else {
+            return self
+        }
+        return ChunckedResource(
+            elements: elements[0..<other.start] + other.elements,
+            start: start,
+            totalCount: other.totalCount
+        )
+    }
+}
+
+example("flatScan") {
+    func getContent(start: Int, count: Int) -> Single<ChunckedResource> {
+        Single.just(
+            ChunckedResource(
+                elements: Array(start ..< min(20, start + count)),
+                start: start,
+                totalCount: 20
+            )
+        )
+    }
+
+    Observable.from(0...10)
+        .flatScan(ChunckedResource()) { previous, _ in
+            getContent(
+                start: previous.elements.count,
+                count: .random(in: 1...3)
+            )
+            .do(onSuccess: { print("+", $0)})
+            .map(previous.merging)
+        }
+        .takeUntil(.inclusive) { $0.elements.count >= $0.totalCount }
+        .subscribe(onNext: { print("=", $0, "\n") })
+}
+
+//: [Next](@next)

Playground/RxSwiftExtPlayground.playground/Pages/fromAsync.xcplaygroundpage/Contents.swift

@@ -1,11 +1,11 @@
 /*:
-> # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
+ > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExt (playground)` scheme for a simulator target
-1. Choose `View > Show Debug Area`
-*/
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
+ */
 
 //: [Previous](@previous)
 import Foundation

Playground/RxSwiftExtPlayground.playground/Pages/ignore.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/mapTo.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/not.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/ofType.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/once.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/pausable.xcplaygroundpage/Contents.swift

@@ -1,11 +1,11 @@
 /*:
-> # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
-*/
+ > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
+ 
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
+ */
 
 //: [Previous](@previous)
 

Playground/RxSwiftExtPlayground.playground/Pages/pausableBuffered.xcplaygroundpage/Contents.swift

@@ -1,11 +1,11 @@
 /*:
-> # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
-*/
+ > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
+ 
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
+ */
 
 //: [Previous](@previous)
 

Playground/RxSwiftExtPlayground.playground/Pages/repeatWithBehavior.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/retryWithBehavior.xcplaygroundpage/Contents.swift

@@ -1,11 +1,11 @@
 /*:
-> # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
-*/
+ > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
+ 
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
+ */
 
 //: [Previous](@previous)
 

Playground/RxSwiftExtPlayground.playground/Pages/unwrap.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
-
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/Pages/zipWith.xcplaygroundpage/Contents.swift

@@ -1,10 +1,10 @@
 /*:
  > # IMPORTANT: To use `RxSwiftExtPlayground.playground`, please:
 
-1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
-1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
-1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
-1. Choose `View > Show Debug Area`
+ 1. Make sure you have [Carthage](https://github.com/Carthage/Carthage) installed
+ 1. Fetch Carthage dependencies from shell: `carthage bootstrap --platform ios`
+ 1. Build scheme `RxSwiftExtPlayground` scheme for a simulator target
+ 1. Choose `View > Show Debug Area`
  */
 
 //: [Previous](@previous)

Playground/RxSwiftExtPlayground.playground/contents.xcplayground

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='6.0' target-platform='ios' display-mode='rendered' last-migration='0900'>
+<playground version='6.0' target-platform='ios' display-mode='raw' buildActiveScheme='true' last-migration='0900'>
     <pages>
         <page name='Index'/>
         <page name='apply'/>
@@ -17,6 +17,7 @@
         <page name='retryWithBehavior'/>
         <page name='unwrap'/>
         <page name='filterMap'/>
+        <page name='flatScan'/>
         <page name='mapAt'/>
         <page name='mapTo'/>
         <page name='fromAsync'/>
@@ -30,5 +31,7 @@
         <page name='UIViewPropertyAnimator.animate'/>
         <page name='UIViewPropertyAnimator.fractionComplete'/>
         <page name='withUnretained'/>
+        <page name='partition'/>
+        <page name='UIScrollView.reachedBottom'/>
     </pages>
 </playground>