By pushing side effects to the edges and keeping our core logic pure, we gain a deterministic and secure execution trace. As a result, debugging shifts from guessing what might have happened to watching exactly what did happen, all without compromising user privacy.
* @param arr 待排序数组
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Facebook Dating: Yes, Facebook has a dating section, and it’s surprisingly massive (and completely free, which is huge). While it's a decent option for casual dating, the vibe tends to be a bit more "friends of friends" and "relationship-focused" than the anonymous, no-strings energy you get from apps like Pure or Feeld. (For Mashable's Chance Townsend, signing up was "the most uneventful dating experience" of his life.) It's worth a shot if you're already on Facebook, but it didn't quite crack my top tier for hookups specifically.