diff --git a/capitulo_1/1.1.14/non-use-strict.js b/capitulo_1/1.1.14/non-use-strict.js
new file mode 100644
index 0000000..ddda5b0
--- /dev/null
+++ b/capitulo_1/1.1.14/non-use-strict.js
@@ -0,0 +1,2 @@
+sum='1+1'
+console.log(eval(sum))
diff --git a/capitulo_1/1.1.14/use-strict.js b/capitulo_1/1.1.14/use-strict.js
new file mode 100644
index 0000000..1e4827e
--- /dev/null
+++ b/capitulo_1/1.1.14/use-strict.js
@@ -0,0 +1,3 @@
+'use strict'
+sum='1+1'
+console.log(eval(sum))