Add json-object-contains-key?, json-list-length, and json-key-not-found.

Update README accordingly and with add examples.

1 files changed, 10 insertions, 4 deletions

diff --git a/lib/zambyte/meta/guile.scm b/lib/zambyte/meta/guile.scm
index cbd998b..96968d6 100644
--- a/lib/zambyte/meta/guile.scm
+++ b/lib/zambyte/meta/guile.scm
@@ -2,8 +2,6 @@
 	(srfi 1)
 	(srfi 2))
 (begin
-  (define string->json json-string->scm)
-  (define json->string scm->json-string)
   (define json-object list)
   (define json-list vector)
   (define json-null 'null)
@@ -13,10 +11,18 @@
   (define (json-null? obj)
     (eq? obj json-null))
 
+  (define (json-object-cointains-key? obj key)
+    (and (assoc key obj) #t))
+
+  (define string->json json-string->scm)
+  (define json->string scm->json-string)
+
   (define (json-object-ref json key)
-    (and-let* ((pair (assoc key json)))
-      (cdr pair)))
+    (or (and-let* ((pair (assoc key json)))
+	  (cdr pair))
+	((json-key-not-found))))
 
   (define json-list-ref vector-ref)
+  (define json-list-length vector-length)
   (define json-object->alist values)
   (define json-list->list vector->list))