transition function implemented jashkenas#2850

Author: mohammadali-seifkashani

modules/_transition.js

@@ -0,0 +1,33 @@
+export function getTogglingfunction() {
+    if (arguments.length == 0) {
+        function inner(input) {
+            return !input;
+        }
+        return inner;
+    } else if (arguments.length != 1) {
+        var args = arguments;
+        function inner(input){
+            let all_arguments = Array.from(args);
+            all_arguments_length = all_arguments.length;
+            index = all_arguments.indexOf(input);
+            return all_arguments[(index + 1) % all_arguments_length];
+        }
+        return inner
+    } else if (arguments[0] instanceof Array){
+        args = arguments[0];
+        function inner(input){
+            let all_arguments = args;
+            all_arguments_length = all_arguments.length;
+            index = all_arguments.indexOf(input);
+            return all_arguments[(index + 1) % all_arguments_length];
+        }
+        return inner   
+    } else {
+        obj = arguments[0];
+        function inner(input) {
+            inner_obj = obj;
+            return inner_obj[input];
+        }
+        return inner
+    }
+}