Comment on private ListBuffer.locate

lrytz · lrytz · commit e361894d2a7a · 2025-05-19T14:27:05.000+02:00
diff --git a/library/src/scala/collection/mutable/ListBuffer.scala b/library/src/scala/collection/mutable/ListBuffer.scala
@@ -186,6 +186,7 @@ class ListBuffer[A]
       last0 = null
   }
 
+  // returns the `::` at `i - 1` (such that its `next` at position `i` can be mutated), or `null` if `i == 0`.
   private def locate(i: Int): Predecessor[A] =
     if (i == 0) null
     else if (i == len) last0

Original file line number	Diff line number	Diff line change
`@@ -186,6 +186,7 @@ class ListBuffer[A]`
`186`	`186`	`last0 = null`
`187`	`187`	`}`
`188`	`188`
	`189`	+ // returns the `::` at `i - 1` (such that its `next` at position `i` can be mutated), or `null` if `i == 0`.
`189`	`190`	`private def locate(i: Int): Predecessor[A] =`
`190`	`191`	`if (i == 0) null`
`191`	`192`	`else if (i == len) last0`