javascript - 是否存在与 Python 的 for 循环等效的 JavaScript？

Question

所以我很失望地发现 JavaScript 的 for (var in array/object) 不等同于 pythons for var in list:。

在 JavaScript 中，您正在迭代索引本身，例如

0, 
1,
2,
... 

与 Python 一样，您正在迭代索引指向的值，例如

"string var at index 0", 
46, 
"string var at index 2",
["array","of","values"],
...

有没有标准的 JavaScript 等同于 Python 的循环机制？

免责声明:

I am aware that the for (var in object) construct is meant to be used to iterate over keys in a dictionary and not generally over indices of an array. I am asking a specific question that pertains to use cases in which I do not care about order(or very much about speed) and just don't feel like using a while loop.

Answer 1

在下一版本的 ECMAScript(ECMAScript6 又名 Harmony)中将是 for-of construct :

for (let word of ["one", "two", "three"]) {
  alert(word);
}

for-of 可用于迭代各种对象、数组、映射、集合和自定义可迭代对象。从这个意义上说，它非常接近 Python 的 for-in。