Add playground files for collectLatest and mapLatest

Author: LukasLechnerDev

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/concurrency/6_collect_latest.kt

@@ -0,0 +1,25 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.concurrency
+
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.flow
+
+suspend fun main() = coroutineScope {
+
+    val flow = flow {
+        repeat(5) {
+            val pancakeIndex = it + 1
+            println("Emitter:    Start Cooking Pancake $pancakeIndex")
+            delay(100)
+            println("Emitter:    Pancake $pancakeIndex ready!")
+            emit(pancakeIndex)
+        }
+    }
+
+    flow.collectLatest {
+        println("Collector:  Start eating pancake $it")
+        delay(300)
+        println("Collector:  Finished eating pancake $it")
+    }
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/concurrency/7_map_latest.kt

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+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.concurrency
+
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.mapLatest
+
+suspend fun main() = coroutineScope {
+
+    val flow = flow {
+        repeat(5) {
+            val pancakeIndex = it + 1
+            println("Emitter:    Start Cooking Pancake $pancakeIndex")
+            delay(100)
+            println("Emitter:    Pancake $pancakeIndex ready!")
+            emit(pancakeIndex)
+        }
+    }.mapLatest {
+        println("Add topping onto the pancake $it")
+        delay(200)
+        it
+    }
+
+    flow.collect {
+        println("Collector:  Start eating pancake $it")
+        delay(300)
+        println("Collector:  Finished eating pancake $it")
+    }
+}