transition-manager/lib/utils/forIn.js

Transition Manager. Framework independent transition manager to transition elements using states and actions.

'use strict';

Object.defineProperty(exports, '__esModule', {
    value: true
});
/*jshint -W084 */
/*jshint unused:false*/

var _hasDontEnumBug, _dontEnums;

function checkDontEnum() {
    _dontEnums = ['toString', 'toLocaleString', 'valueOf', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'constructor'];

    _hasDontEnumBug = true;

    for (var key in { 'toString': null }) {
        _hasDontEnumBug = false;
    }
}

/**
 * Similar to Array/forEach but works over object properties and fixes Don't
 * Enum bug on IE.
 * based on: http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
 */
function forIn(obj, fn, thisObj) {
    var key,
        i = 0;
    // no need to check if argument is a real object that way we can use
    // it for arrays, functions, date, etc.

    //post-pone check till needed
    if (_hasDontEnumBug == null) {
        checkDontEnum();
    }

    for (key in obj) {
        if (exec(fn, obj, key, thisObj) === false) {
            break;
        }
    }

    if (_hasDontEnumBug) {
        while (key = _dontEnums[i++]) {
            // since we aren't using hasOwn check we need to make sure the
            // property was overwritten
            if (obj[key] !== Object.prototype[key]) {
                if (exec(fn, obj, key, thisObj) === false) {
                    break;
                }
            }
        }
    }
}

function exec(fn, obj, key, thisObj) {
    return fn.call(thisObj, obj[key], key, obj);
}

exports['default'] = forIn;
module.exports = exports['default'];