Golang模棱两可的错误重新定义

发布时间：2020-12-16 09:25:31 所属栏目：大数据来源：网络整理

导读：为什么可以重新定义错误变量？ err := ipdf.Open(source)if err != nil { panic("Couldn't open pdf.")}payload,err := ioutil.ReadFile(other)if err != nil { panic("Couldn't read other file.")} 解决方法 Unlike regular variable declarations,a short

为什么可以重新定义错误变量？

err := ipdf.Open(source)
if err != nil {
    panic("Couldn't open pdf.")
}

payload,err := ioutil.ReadFile(other)
if err != nil {
    panic("Couldn't read other file.")
}

解决方法

Unlike regular variable declarations,a short variable declaration may redeclare variables provided they were originally declared earlier in the same block (or the parameter lists if the block is the function body) with the same type,and at least one of the non-blank variables is new. As a consequence,redeclaration can only appear in a multi-variable short declaration. Redeclaration does not introduce a new variable; it just assigns a new value to the original.

https://golang.org/ref/spec#Short_variable_declarations

（编辑：李大同）

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