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'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = iterator;

var _isArrayLike = require('lodash/isArrayLike');

var _isArrayLike2 = _interopRequireDefault(_isArrayLike);

var _getIterator = require('./getIterator');

var _getIterator2 = _interopRequireDefault(_getIterator);

var _keys = require('lodash/keys');

var _keys2 = _interopRequireDefault(_keys);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function createArrayIterator(coll) {
    var i = -1;
    var len = coll.length;
    return function next() {
        return ++i < len ? { value: coll[i], key: i } : null;
    };
}

function createES2015Iterator(iterator) {
    var i = -1;
    return function next() {
        var item = iterator.next();
        if (item.done) return null;
        i++;
        return { value: item.value, key: i };
    };
}

function createObjectIterator(obj) {
    var okeys = (0, _keys2.default)(obj);
    var i = -1;
    var len = okeys.length;
    return function next() {
        var key = okeys[++i];
        return i < len ? { value: obj[key], key: key } : null;
    };
}

function iterator(coll) {
    if ((0, _isArrayLike2.default)(coll)) {
        return createArrayIterator(coll);
    }

    var iterator = (0, _getIterator2.default)(coll);
    return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
}
module.exports = exports['default'];