Small refactoring to use Family.CodeExtension.size when appropriate

libraries/tools/kotlin-stdlib-gen/src/templates/Elements.kt

@@ -292,7 +292,7 @@ object Elements : TemplateGroupBase() {
             on(Platform.JS) {
                 inline(Inline.No)
 
-                val size = if (f == CharSequences) "length" else "size"
+                val size = f.code.size
                 body {
                     """
                     return elementAtOrElse(index) { throw IndexOutOfBoundsException("index: $index, $size: $$size}") }
@@ -944,11 +944,10 @@ object Elements : TemplateGroupBase() {
         }
         specialFor(ArraysOfObjects, ArraysOfPrimitives, ArraysOfUnsigned, CharSequences) {
             body {
-                val size = if (family == CharSequences) "length" else "size"
                 """
                 if (isEmpty())
                     throw NoSuchElementException("${f.doc.collection.capitalize()} is empty.")
-                return get(random.nextInt($size))
+                return get(random.nextInt(${f.code.size}))
                 """
             }
         }

libraries/tools/kotlin-stdlib-gen/src/templates/Generators.kt

@@ -966,7 +966,7 @@ object Generators : TemplateGroupBase() {
         }
         body(CharSequences) {
             """
-            val size = ${if (f == CharSequences) "length" else "size" } - 1
+            val size = ${f.code.size} - 1
             if (size < 1) return emptyList()
             val result = ArrayList<R>(size)
             for (index in 0 until size) {

libraries/tools/kotlin-stdlib-gen/src/templates/Snapshots.kt

@@ -162,7 +162,7 @@ object Snapshots : TemplateGroupBase() {
         }
         body(CharSequences, ArraysOfPrimitives, ArraysOfObjects) {
             """
-            return when (${ if (f == CharSequences) "length" else "size" }) {
+            return when (${f.code.size}) {
                 0 -> emptyList()
                 1 -> listOf(this[0])
                 else -> this.toMutableList()