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import isArrayLike from './isArrayLike.js'
import getIterator from './getIterator.js'
 
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 = obj ? Object.keys(obj) : [];
 var i = -1;
 var len = okeys.length;
 return function next() {
 var key = okeys[++i];
 if (key === '__proto__') {
 return next();
 }
 return i < len ? {value: obj[key], key} : null;
 };
}
 
export default function createIterator(coll) {
 if (isArrayLike(coll)) {
 return createArrayIterator(coll);
 }
 
 var iterator = getIterator(coll);
 return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
}