added general purpose combine* extensions

Author: johsoe

app/src/main/java/com/monstarlab/extensions/FlowExtensions.kt

@@ -0,0 +1,40 @@
+package com.monstarlab.extensions
+
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.LifecycleCoroutineScope
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.launch
+
+fun <T1, T2> CoroutineScope.combineFlows(flow1: Flow<T1>, flow2: Flow<T2>, collectBlock: (suspend (T1, T2) -> Unit)) {
+    launch {
+        flow1.combine(flow2) { v1, v2 ->
+            collectBlock.invoke(v1, v2)
+        }.collect {
+            // Empty collect block to trigger ^
+        }
+    }
+}
+
+fun <T1, T2, T3> CoroutineScope.combineFlows(flow1: Flow<T1>, flow2: Flow<T2>, flow3: Flow<T3>, collectBlock: (suspend (T1, T2, T3) -> Unit)) {
+    launch {
+        combine(flow1, flow2, flow3) { v1, v2, v3 ->
+            collectBlock.invoke(v1, v2, v3)
+        }.collect {
+            // Empty collect block to trigger ^
+        }
+    }
+}
+
+fun <T1, T2, T3, T4> CoroutineScope.combineFlows(flow1: Flow<T1>, flow2: Flow<T2>, flow3: Flow<T3>, flow4: Flow<T4>, collectBlock: (suspend (T1, T2, T3, T4) -> Unit)) {
+    launch {
+        combine(flow1, flow2, flow3, flow4) { v1, v2, v3, v4 ->
+            collectBlock.invoke(v1, v2, v3, v4)
+        }.collect {
+            // Empty collect block to trigger ^
+        }
+    }
+}