Sometimes shorter code with filterTo, mapTo and flatMapTo

idea/testData/intentions/loopToCallChain/assignFilter_ArrayListRequired.kt.after

@@ -2,7 +2,6 @@
 import java.util.ArrayList
 
 fun foo(list: List<String>): ArrayList<String> {
-    val result = ArrayList<String>()
-    <caret>list.filterTo(result) { it.length > 0 }
+    <caret>val result = list.filterTo(ArrayList<String>()) { it.length > 0 }
     return result
 }

idea/testData/intentions/loopToCallChain/assignFilter_ArrayListRequired2.kt.after

@@ -3,8 +3,7 @@ import java.util.ArrayList
 
 fun foo(list: List<String>, p: Int): ArrayList<String> {
     return if (p > 0) {
-        val result = ArrayList<String>()
-        <caret>list.filterTo(result) { it.length > 0 }
+        <caret>val result = list.filterTo(ArrayList<String>()) { it.length > 0 }
         result
     }
     else {

idea/testData/intentions/loopToCallChain/assignFilter_ArrayListRequired3.kt.after

@@ -3,8 +3,7 @@ import java.util.*
 
 fun foo(list: List<String>): ArrayList<String> {
     return run {
-        val result = ArrayList<String>()
-        <caret>list.filterTo(result) { it.length > 0 }
+        <caret>val result = list.filterTo(ArrayList<String>()) { it.length > 0 }
         result
     }
 }

idea/testData/intentions/loopToCallChain/filterTo2.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+fun foo(list: List<String>) {
+    val target = createCollection()
+    <caret>for (s in list) {
+        if (s.length > 0)
+            target.add(s)
+    }
+}
+
+fun createCollection() = java.util.ArrayList<String>()

idea/testData/intentions/loopToCallChain/filterTo2.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+fun foo(list: List<String>) {
+    val target = createCollection()
+    <caret>list.filterTo(target) { it.length > 0 }
+}
+
+fun createCollection() = java.util.ArrayList<String>()

idea/testData/intentions/loopToCallChain/flatMapTo2.kt

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+import java.util.ArrayList
+
+fun foo(list: List<String>): List<String> {
+    val target = ArrayList<String>(100)
+    <caret>for (s in list) {
+        for (line in s.lines()) {
+            target.add(line)
+        }
+    }
+    return target
+}

idea/testData/intentions/loopToCallChain/flatMapTo2.kt.after

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+import java.util.ArrayList
+
+fun foo(list: List<String>): List<String> {
+    <caret>val target = list.flatMapTo(ArrayList<String>(100)) { it.lines() }
+    return target
+}

idea/testData/intentions/loopToCallChain/flatMapTo3.kt

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+fun foo(list: List<String>): List<String> {
+    val target = createCollection()
+    <caret>for (s in list) {
+        for (line in s.lines()) {
+            target.add(line)
+        }
+    }
+    return target
+}
+
+fun createCollection() = java.util.ArrayList<String>()

idea/testData/intentions/loopToCallChain/flatMapTo3.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun foo(list: List<String>): List<String> {
+    val target = createCollection()
+    <caret>list.flatMapTo(target) { it.lines() }
+    return target
+}
+
+fun createCollection() = java.util.ArrayList<String>()

idea/testData/intentions/loopToCallChain/mapTo3.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+import java.util.ArrayList
+
+fun foo(list: List<String>): List<Int> {
+    val target = ArrayList<Int>(100)
+    <caret>for (s in list) {
+        if (s.length > 0)
+            target.add(s.hashCode())
+    }
+    return target
+}

idea/testData/intentions/loopToCallChain/mapTo3.kt.after

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+import java.util.ArrayList
+
+fun foo(list: List<String>): List<Int> {
+    <caret>val target = list
+            .filter { it.length > 0 }
+            .mapTo(ArrayList<Int>(100)) { it.hashCode() }
+    return target
+}

idea/testData/intentions/loopToCallChain/mapTo4.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+fun foo(list: List<String>): List<Int> {
+    val target = createCollection()
+    <caret>for (s in list) {
+        if (s.length > 0)
+            target.add(s.hashCode())
+    }
+    return target
+}
+
+fun createCollection(): MutableList<Int> = java.util.ArrayList()

idea/testData/intentions/loopToCallChain/mapTo4.kt.after

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+fun foo(list: List<String>): List<Int> {
+    val target = createCollection()
+    <caret>list
+            .filter { it.length > 0 }
+            .mapTo(target) { it.hashCode() }
+    return target
+}
+
+fun createCollection(): MutableList<Int> = java.util.ArrayList()