在Go中测试空字符串的最佳方法是什么? [英] What is the best way to test for an empty string in Go?
问题描述
如果len(mystring)(测试非空字符串) )> 0 {}
或者:
if mystring!={}
还是别的什么? / b>
这两种样式都用在Go的标准库中。
if len(s)> 0 {...}
可以在 strconv $中找到c $ c>包: http://golang.org/src/pkg/strconv/atoi.go
if s!={...}
$可以在
encoding / json
包中找到p $ p>
:http://golang.org/src/pkg/encoding/json/encode.go
<两者都是惯用的,而且足够清晰。这是一个个人品味和清晰度的问题。
Russ Cox在 golang-nuts线程:
使代码变得清晰的一种。
如果我要查看元素x,我通常会编写
len(s)> x,即使对于x == 0,但是如果我关心
是这个特定的字符串我倾向于写s ==。假设一个成熟的编译器会将
len(s)== 0和s ==编译成相同的,高效的代码。
现在6g等编译s ==到一个函数调用
,而len(s)== 0不是,但这是我的工作清单来解决。
清除代码。
Which method is best (more idomatic) for testing non-empty strings (in Go)?
if len(mystring) > 0 { }
Or:
if mystring != "" { }
Or something else?
解决方案Both styles are used within the Go's standard libraries.
if len(s) > 0 { ... }
can be found in the
strconv
package: http://golang.org/src/pkg/strconv/atoi.goif s != "" { ... }
can be found in the
encoding/json
package: http://golang.org/src/pkg/encoding/json/encode.goBoth are idiomatic and and clear enough. It is more a matter of personal taste and about clarity.
Russ Cox writes in a golang-nuts thread:
The one that makes the code clear.
If I'm about to look at element x I typically write
len(s) > x, even for x == 0, but if I care about
"is it this specific string" I tend to write s == "".It's reasonable to assume that a mature compiler will compile
len(s) == 0 and s == "" into the same, efficient code.
Right now 6g etc do compile s == "" into a function call
while len(s) == 0 is not, but that's been on my to-do list to fix.Make the code clear.
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