关于go:go-stringsToLower-原理解析

一、ASCII 介绍
英语的字母大小写转化，是咱们常遇到的字符串解决状况。

一、go中解决字符串 转化小写

func ToLower(s string) string {    b := strings.Builder{}    b.Grow(len(s))    for i := 0; i < len(s); i++ {        c := s[i]        if 'A' <= c && c <= 'Z' {            c += 'a' - 'A'        }        b.WriteByte(c)    }    return b.String()}

测试函数：

import "testing"func TestToLower(t *testing.T) {    type args struct {        s string    }    tests := []struct {        name string        args args        want string    }{        {"1", args{s: "A"}, "a"},        {"1", args{s: "Aa"}, "aa"},        {"1", args{s: "Aa0"}, "aa0"},        {"1", args{s: ")A_$"}, ")a_$"},        {"1", args{s: "0000"}, "0000"},        {"1", args{s: "哈哈a"}, "哈哈a"},        {"1", args{s: "哈哈A啊啊"}, "哈哈a啊啊"},    }    for _, tt := range tests {        t.Run(tt.name, func(t *testing.T) {            if got := ToLower(tt.args.s); got != tt.want {                t.Errorf("ToLower() = %v, want %v", got, tt.want)            }        })    }}