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var data = {'a': 'b', 'c': 'd'};
data[Symbol.iterator] = function() {
var array = Object.keys(data),
nextIndex = 0;
return {
next: function() {
return nextIndex < array.length ?
{value: data[array[nextIndex++]], done: false} :
{done: true};
}
};
};
function fn() {
var ret = '';
for (var value of data) {
ret += value;
}
return ret;
}
assertEqual(fn(), 'bd');
test(fn);