[rbdr/dotfiles] /

// 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 isCallable = require('./is-callable')
  , callable   = require('./valid-callable')
  , value      = require('./valid-value')

  , 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(isCallable(compareFn) ? compareFn.bind(obj) : undefined);
                }
                return list[method](function (key, index) {
                        if (!propertyIsEnumerable.call(obj, key)) return defVal;
                        return call.call(cb, thisArg, obj[key], key, obj, index);
                });
        };
};