Indexed iteration

kotlin-examples/src/_02_extensions/MultiDecl.kt

@@ -9,7 +9,8 @@ fun main(args : Array<String>) {
     val (x, y) = Point(1, 2)
     println("($x, $y)")
 
-    println(parseFileNameAndLine("Foo12.java:12"))
+//    testMultiReturn()
+//    testIndexedIteration()
 }
 
 fun Point.component1() = x
@@ -63,30 +64,28 @@ fun parseFileNameAndLine(str: String): Location {
 
 
 
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-fun String.toGroupsByRegex(regex: String): List<String>? {
-    val m = Pattern.compile(regex).matcher(this)
-    if (!m.matches()) return null
-    val result = ArrayList<String>()
-    for (g in 0..m.groupCount()) {
-        result.add(m.group(g)!!)
+fun testIndexedIteration() {
+    for ((i, c) in "abcd".indexed) {
+        println("s[$i] = $c")
     }
-    return result
 }
 
 
+val String.indexed: StringIteratorWithIndices
+        get() = StringIteratorWithIndices(this)
 
+class StringIteratorWithIndices(val str: String) : Iterator<Pair<Int, Char>> {
+    var i = 0
 
+    public override fun next(): Pair<Int, Char> {
+        val result = Pair(i, str[i])
+        i++
+        return result
+    }
 
+    public override fun hasNext(): Boolean = i < str.length
 
+}
 
 
 
@@ -103,58 +102,12 @@ fun String.toGroupsByRegex(regex: String): List<String>? {
 
 
 
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-val String.indexed: StringIteratorWithIndices
-        get() = StringIteratorWithIndices(this)
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-class StringIteratorWithIndices(val str: String) : Iterator<Pair<Int, Char>> {
-    var i = 0
-
-    public override fun next(): Pair<Int, Char> {
-        val result = Pair(i, str[i])
-        i++
-        return result
+fun String.toGroupsByRegex(regex: String): List<String>? {
+    val m = Pattern.compile(regex).matcher(this)
+    if (!m.matches()) return null
+    val result = ArrayList<String>()
+    for (g in 0..m.groupCount()) {
+        result.add(m.group(g)!!)
     }
-
-    public override fun hasNext(): Boolean = i < str.length
-
-}
+    return result
+}