golang中字符串和数字转换

数字转成字符串，再与字符串拼接

str := strconv.Itoa(12)
println("str + '23' = ", str+"23")

数字型字符串转换成数字，再进行四则运算

n, err := strconv.Atoi("123")
if err!=nil {
	panic(err)
}
println("12+n = ", 12+n)

// `结果`
12+n =  135
str + '23' =  1223

func Sprintf(format string, a ...interface{}) string

str := fmt.Sprintf("123%s", "hello")
//输出：`123hello`

func Join(a []string, sep string) string

str := []string{"hello", "world"}
s := strings.Join(str, " ")
//输出：`hello world`

大量的字符串拼接，strings.Builder 是最好的方式。

var build strings.Builder
build.WriteString("123")
build.WriteString("ade")
build.WriteString("ade")
build.WriteString("ade")
println(build.String())

//输出：`123adeadeade`

buffer := bytes.Buffer{}
buffer.WriteString("hello")
buffer.WriteString("golang")
println(buffer.String())

//输出：`hellogolang`