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Merge pull request #60 from howudoing/master

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Update ch5-08.md
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@ -147,7 +147,7 @@ _ = double(4)
// "double(4) = 8"
```
可能doulbe函数过于简单，看不出这个小技巧的作用，但对于有许多return语句的函数而言，这个技巧很有用。
可能double函数过于简单，看不出这个小技巧的作用，但对于有许多return语句的函数而言，这个技巧很有用。
被延迟执行的匿名函数甚至可以修改函数返回给调用者的返回值：