8 minutes read (About 1148 words)

Swift Tips

结构相等符 == 被用来判断两个值是否相等。而引用相等 === 用来检查两个引用是否具有同一性，即是否指向同一个对象。

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class A {
    var p = 0
}

var a = A()
var b = a
print(b == a)
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Swift4新特性

参考自：Ray Wenderlich - iOS11 by Tutorials

One-sided ranges

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