如何在JavaScript中将格式更改为数组？

Question

我正在以这种格式获得一些价值

 [["first"],["second"],["third"]]

我希望得到

 {"first","second","third"}

我应该在javascript中做什么？

Answer 1

这是非法的：{"first","second","third"}

对象必须是键值对的映射。你能做到的最好的就是：

{`first`: null, `second`: null, `third`: null}

---

JSFiddle DEMO

var arr2d = [["first"], ["second"], ["third"]];
var arrFlat = arr2d.reduce(function(a, b) {
    return a.concat(b);
});

var obj = {};
for (var i = 0; i < arrFlat.length; i++) {
    obj[arrFlat[i]] = null;
}

console.log(obj);