eval-and-replace function added

lib/extensions/development/init.el

@@ -12,6 +12,18 @@
   "Tested with v0.6.1. Extracted from `yas/expand-1'"
   (first (yas/current-key)))
 
+
+(defun eval-and-replace ()
+  "Replace the preceding sexp with its value."
+  (interactive)
+  (backward-kill-sexp)
+  (condition-case nil
+      (prin1 (eval (read (current-kill 0)))
+             (current-buffer))
+    (error (message "Invalid expression")
+           (insert (current-kill 0)))))
+
+
 ;;;###autoload
 (defun extension/development-initialize ()
   "Development plugin initialization."