From de2ad1bc40cd3546f35d1271a9029a30595e38e9 Mon Sep 17 00:00:00 2001
From: Mona Mohamadinia <mona.mohamadinia@gmail.com>
Date: Tue, 21 Jul 2020 19:24:20 +0430
Subject: [PATCH] How to get the current index in for each Kotlin (#9710)

---
 .../com/baeldung/index/IndexedIteration.kt    | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 core-kotlin-modules/core-kotlin-collections/src/main/kotlin/com/baeldung/index/IndexedIteration.kt

diff --git a/core-kotlin-modules/core-kotlin-collections/src/main/kotlin/com/baeldung/index/IndexedIteration.kt b/core-kotlin-modules/core-kotlin-collections/src/main/kotlin/com/baeldung/index/IndexedIteration.kt
new file mode 100644
index 0000000000..07fb595ede
--- /dev/null
+++ b/core-kotlin-modules/core-kotlin-collections/src/main/kotlin/com/baeldung/index/IndexedIteration.kt
@@ -0,0 +1,33 @@
+package com.baeldung.index
+
+fun main() {
+
+    // Index only
+    val colors = listOf("Red", "Green", "Blue")
+    for (i in colors.indices) {
+        println(colors[i])
+    }
+
+    val colorArray = arrayOf("Red", "Green", "Blue")
+    for (i in colorArray.indices) {
+        println(colorArray[i])
+    }
+
+    (0 until colors.size).forEach { println(colors[it]) }
+    for (i in 0 until colors.size) {
+        println(colors[i])
+    }
+
+    // Index and Value
+    colors.forEachIndexed { i, v -> println("The value for index $i is $v") }
+    for (indexedValue in colors.withIndex()) {
+        println("The value for index ${indexedValue.index} is ${indexedValue.value}")
+    }
+
+    for ((i, v) in colors.withIndex()) {
+        println("The value for index $i is $v")
+    }
+
+    colors.filterIndexed { i, _ -> i % 2 == 0 }
+    colors.filterIndexed { _, v -> v == "RED" }
+}