Golang字符串比较

　　Golang 字符串比较
　　字符串比较， 可以直接使用  ==  进行比较， 也可用用 strings.Compare  比较
　　go 中字符串比较有三种方式： ==  比较strings.Compare  比较strings.EquslFold  比较 #### 代码示例 ```go fmt.Println(＂go＂==＂go＂) fmt.Println(＂GO＂==＂go＂)  fmt.Println(strings.Compare(＂GO＂,＂go＂)) fmt.Println(strings.Compare(＂go＂,＂go＂))  fmt.Println(strings.EqualFold(＂GO＂,＂go＂))
　　上述代码执行结果如下： true false -1 0 true Compare 和 EqualFold 区别EqualFold  是比较UTF-8编码在小写的条件下是否相等，不区分大小写// EqualFold reports whether s and t, interpreted as UTF-8 strings, // are equal under Unicode case-folding. func EqualFold(s, t string) bool 要注意的是  Compare  函数是区分大小写的， ==  速度执行更快
　　/ Compare is included only for symmetry with package bytes. // It is usually clearer and always faster to use the built-in // string comparison operators ==, <, >, and so on. func Compare(a, b string) int 忽略大小写比较
　　有时候要忽略大小写比较, 可以使用 strings.EqualFold  字符串比较是否相等源码实现// EqualFold reports whether s and t, interpreted as UTF-8 strings, // are equal under Unicode case-folding, which is a more general // form of case-insensitivity. func EqualFold(s, t string) bool {     for s != ＂＂ && t != ＂＂ {         // Extract first rune from each string.         var sr, tr rune         if s[0] < utf8.RuneSelf {             sr, s = rune(s[0]), s[1:]         } else {             r, size := utf8.DecodeRuneInString(s)             sr, s = r, s[size:]         }         if t[0] < utf8.RuneSelf {             tr, t = rune(t[0]), t[1:]         } else {             r, size := utf8.DecodeRuneInString(t)             tr, t = r, t[size:]         }          // If they match, keep going; if not, return false.          // Easy case.         if tr == sr {             continue         }          // Make sr < tr to simplify what follows.         if tr < sr {             tr, sr = sr, tr         }         // Fast check for ASCII.         if tr < utf8.RuneSelf {             // ASCII only, sr/tr must be upper/lower case             if ＂A＂ <= sr && sr <= ＂Z＂ && tr == sr+＂a＂-＂A＂ {                 continue             }             return false         }          // General case. SimpleFold(x) returns the next equivalent rune > x         // or wraps around to smaller values.         r := unicode.SimpleFold(sr)         for r != sr && r < tr {             r = unicode.SimpleFold(r)         }         if r == tr {             continue         }         return false     }      // One string is empty. Are both?     return s == t }
　　通过源码可看到  if ＂A＂ <= sr && sr <= ＂Z＂ && tr == sr+＂a＂-＂A＂  可以看到不区分大小写的实现。
　　看个完整测试代码： // Golang program to illustrate the // strings.EqualFold() Function package main  // importing fmt and strings import (  ＂fmt＂  ＂strings＂ )  // calling main method func main() {  // case insensitive comparing and returns true.  fmt.Println(strings.EqualFold(＂Geeks＂, ＂Geeks＂))   // case insensitive comparing and returns true.  fmt.Println(strings.EqualFold(＂computerscience＂, ＂computerscience＂)) }
　　执行结构 true true 欢迎关注工作号:程序员财富自由之路
　　参考资料https://www.geeksforgeeks.org/strings-equalfold-function-in-golang-with-examples/ https://cloud.tencent.com/developer/article/1651885