1 files changed, 25 insertions, 0 deletions
diff --git a/lib/during.js b/lib/during.js
new file mode 100644
index 0000000..6b7c4d4
--- /dev/null
+++ b/lib/during.js
@@ -0,0 +1,25 @@
+'use strict';
+
+import noop from 'lodash/noop';
+import rest from 'lodash/rest';
+
+export default function during(test, iterator, cb) {
+    cb = cb || noop;
+
+    var next = rest(function(err, args) {
+        if (err) {
+            cb(err);
+        } else {
+            args.push(check);
+            test.apply(this, args);
+        }
+    });
+
+    var check = function(err, truth) {
+        if (err) return cb(err);
+        if (!truth) return cb(null);
+        iterator(next);
+    };
+
+    test(check);
+}