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-rw-r--r--immutable.go5
1 files changed, 5 insertions, 0 deletions
diff --git a/immutable.go b/immutable.go
index e8fac90..c1a8aef 100644
--- a/immutable.go
+++ b/immutable.go
@@ -246,6 +246,11 @@ func (b *ListBuilder) List() *List {
return list
}
+// Len returns the number of elements in the underlying list.
+func (b *ListBuilder) Len() int {
+ return b.list.Len()
+}
+
// Get returns the value at the given index. Similar to slices, this method will
// panic if index is below zero or is greater than or equal to the list size.
func (b *ListBuilder) Get(index int) interface{} {