--- /dev/null
+// Internal method, used by iteration functions.
+// Calls a function for each key-value pair found in object
+// Optionally takes compareFn to iterate object in specific order
+
+'use strict';
+
+var callable = require('./valid-callable')
+ , value = require('./valid-value')
+
+ , bind = Function.prototype.bind, call = Function.prototype.call, keys = Object.keys
+ , propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
+
+module.exports = function (method, defVal) {
+ return function (obj, cb/*, thisArg, compareFn*/) {
+ var list, thisArg = arguments[2], compareFn = arguments[3];
+ obj = Object(value(obj));
+ callable(cb);
+
+ list = keys(obj);
+ if (compareFn) {
+ list.sort((typeof compareFn === 'function') ? bind.call(compareFn, obj) : undefined);
+ }
+ if (typeof method !== 'function') method = list[method];
+ return call.call(method, list, function (key, index) {
+ if (!propertyIsEnumerable.call(obj, key)) return defVal;
+ return call.call(cb, thisArg, obj[key], key, obj, index);
+ });
+ };
+};