Also strings

2 files changed, 2 insertions, 2 deletions

diff --git a/README.md b/README.md
index a8e355d..fcbb5bd 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,7 @@ Other built-in functions are:
 * `head(list)`: returns the first element of a list
 * `tail(list)`: returns the end of a list excluding the first element
 * `empty?(list)`: returns true if a list is empty
-* `size(list)`: returns the size of a list
+* `size(list)`: returns the size of a list or a string
 * `min(list)`: returns the smaller value in a list
 * `max(list)`: returns the larger value in a list
 * `contains(value list)`: returns true if a list contains a value
diff --git a/funco b/funco
index c6d0299..aab0a0c 100755
--- a/funco
+++ b/funco
@@ -407,7 +407,7 @@ def default_env():
             "head": lambda xs: xs[0],
             "tail": lambda xs: xs[1:],
             "empty?": lambda xs: xs == [],
-            "size": lambda xs: len(xs) if isinstance(xs, list) else None,
+            "size": lambda xs: len(xs) if isinstance(xs, (list, str)) else None,
             "min": lambda xs: min(xs) if isinstance(xs, list) else None,
             "max": lambda xs: max(xs) if isinstance(xs, list) else None,
             "contains": lambda x, xs: x in xs,