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# 表达式(Expressions)
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---
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-----------------
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Swift 中存在四种表达式: 前缀(prefix)表达式,二元(binary)表达式,主要(primary)表达式和后缀(postfix)表达式。表达式可以返回一个值,以及运行某些逻辑(causes a side effect)。
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