Add playground files for intermediate flow operators

Author: LukasLechnerDev

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/1_map.kt

@@ -1,10 +1,12 @@
 package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
 
 import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.mapNotNull
 
 suspend fun main() {
 
     flowOf(1, 2, 3, 4, 5)
+        .mapNotNull { "Emission $it" }
         .collect { collectedValue ->
             println(collectedValue)
         }

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/2_filter.kt

@@ -0,0 +1,14 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
+
+import kotlinx.coroutines.flow.filterIsInstance
+import kotlinx.coroutines.flow.flowOf
+
+suspend fun main() {
+
+    flowOf(1, 2, 3, 4, 5)
+        .filterIsInstance<Int>()
+        .collect { collectedValue ->
+            println(collectedValue)
+        }
+
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/3_take.kt

@@ -0,0 +1,14 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
+
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.takeWhile
+
+suspend fun main() {
+
+    flowOf(1, 2, 3, 4, 5)
+        .takeWhile { it < 3 }
+        .collect { collectedValue ->
+            println(collectedValue)
+        }
+
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/4_drop.kt

@@ -0,0 +1,14 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
+
+import kotlinx.coroutines.flow.dropWhile
+import kotlinx.coroutines.flow.flowOf
+
+suspend fun main() {
+
+    flowOf(1, 2, 3, 4, 5, 1)
+        .dropWhile { it < 2 }
+        .collect { collectedValue ->
+            println(collectedValue)
+        }
+
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/5_transform.kt

@@ -0,0 +1,17 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
+
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.transform
+
+suspend fun main() {
+
+    flowOf(1, 2, 3, 4, 5, 1)
+        .transform {
+            emit(it)
+            emit(it * 10)
+        }
+        .collect { collectedValue ->
+            println(collectedValue)
+        }
+
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/6_withIndex.kt

@@ -0,0 +1,14 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
+
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.withIndex
+
+suspend fun main() {
+
+    flowOf(1, 2, 3, 4, 5, 1)
+        .withIndex()
+        .collect { collectedValue ->
+            println(collectedValue)
+        }
+
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/flow/intermediate_operators/7_distinctUntilChanged.kt

@@ -0,0 +1,14 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.flow.intermediate_operators
+
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.flowOf
+
+suspend fun main() {
+
+    flowOf(1, 1,  2, 3, 4, 5, 1)
+        .distinctUntilChanged()
+        .collect { collectedValue ->
+            println(collectedValue)
+        }
+
+}