Be aware your code breaks pair surrogates, which might be undesirable:
```js
var str = "a_\uD83D\uDE80_b";
str.split("").reverse().join(""); // "b_\uDE80\uD83D_a" :(
[...str].reverse().join(""); // "b_\uD83D\uDE80_a" :)
```--Oriol
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