iOS 关于字符串Hash和isEqual效率的对比
2018-11-09 本文已影响0人
pokeey
因为不知道里面是怎么实现的，做了个小实验对比了一下，实验结果发现这两个没有什么区别
其实我感觉isEqual应该就是根据hash来判断的
if (self == object) elif self.hash == object.hash
实验数据
60 length <hashT> in 0.000000 ms
60 length <hashT> in 0.000954 ms
60 length <hashT> in 0.000000 ms
60 length <hashT> in 0.000000 ms
60 length <hashT> in 0.001073 ms
60 length <hashT> in 0.000954 ms
60 length <hashT> in 0.000954 ms
60 length <hashT> in 0.000000 ms
60 length <hashT> in 0.000000 ms
60 length <hashT> in 0.000000 ms
60 length <equalT> in 0.000000 ms
60 length <equalT> in 0.000000 ms
60 length <equalT> in 0.000000 ms
60 length <equalT> in 0.000954 ms
60 length <equalT> in 0.000954 ms
60 length <equalT> in 0.000000 ms
60 length <equalT> in 0.000954 ms
60 length <equalT> in 0.000000 ms
60 length <equalT> in 0.000000 ms
60 length <equalT> in 0.000000 ms
----------^0-----------
600 length <hashT> in 0.000000 ms
600 length <hashT> in 0.001073 ms
600 length <hashT> in 0.000000 ms
600 length <hashT> in 0.002027 ms
600 length <hashT> in 0.001073 ms
600 length <hashT> in 0.000954 ms
600 length <hashT> in 0.000000 ms
600 length <hashT> in 0.000954 ms
600 length <hashT> in 0.000000 ms
600 length <hashT> in 0.000954 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
600 length <equalT> in 0.000000 ms
----------^1-----------
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.001073 ms
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.001073 ms
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.000000 ms
6000 length <hashT> in 0.000954 ms
6000 length <equalT> in 0.000954 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000954 ms
6000 length <equalT> in 0.000000 ms
6000 length <equalT> in 0.000000 ms
----------^2-----------
60000 length <hashT> in 0.000954 ms
60000 length <hashT> in 0.000954 ms
60000 length <hashT> in 0.000000 ms
60000 length <hashT> in 0.000000 ms
60000 length <hashT> in 0.000954 ms
60000 length <hashT> in 0.000000 ms
60000 length <hashT> in 0.000000 ms
60000 length <hashT> in 0.000000 ms
60000 length <hashT> in 0.001073 ms
60000 length <hashT> in 0.000954 ms
60000 length <equalT> in 0.000954 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
60000 length <equalT> in 0.000000 ms
----------^3-----------
600000 length <hashT> in 0.001073 ms
600000 length <hashT> in 0.000000 ms
600000 length <hashT> in 0.000954 ms
600000 length <hashT> in 0.001073 ms
600000 length <hashT> in 0.000000 ms
600000 length <hashT> in 0.000000 ms
600000 length <hashT> in 0.000000 ms
600000 length <hashT> in 0.001073 ms
600000 length <hashT> in 0.000954 ms
600000 length <hashT> in 0.000000 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000954 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000000 ms
600000 length <equalT> in 0.000954 ms
600000 length <equalT> in 0.000000 ms
----------^4-----------
6000000 length <hashT> in 0.005007 ms
6000000 length <hashT> in 0.000000 ms
6000000 length <hashT> in 0.001073 ms
6000000 length <hashT> in 0.000000 ms
6000000 length <hashT> in 0.000000 ms
6000000 length <hashT> in 0.000000 ms
6000000 length <hashT> in 0.000954 ms
6000000 length <hashT> in 0.000000 ms
6000000 length <hashT> in 0.001073 ms
6000000 length <hashT> in 0.000000 ms
6000000 length <equalT> in 0.002027 ms
6000000 length <equalT> in 0.000000 ms
6000000 length <equalT> in 0.000000 ms
6000000 length <equalT> in 0.000954 ms
6000000 length <equalT> in 0.001073 ms
6000000 length <equalT> in 0.001073 ms
6000000 length <equalT> in 0.000000 ms
6000000 length <equalT> in 0.000000 ms
6000000 length <equalT> in 0.000000 ms
6000000 length <equalT> in 0.000000 ms
----------^5-----------
