diff --git a/JS/reto1.js b/JS/reto1.js
new file mode 100644
index 0000000..7b2fccd
--- /dev/null
+++ b/JS/reto1.js
@@ -0,0 +1,3 @@
+let arr = ['julio', 'pedro', 'vero', 'juan'];
+const lengthArr = arr.map(((item,index)=>item.length));
+console.log(lengthArr);
\ No newline at end of file