string of Golang (go Language) code tricks (String)

This is a creation in Article, where the information may have evolved or changed.

• Change some characters in a string

str := "hello roc"

bytes := []byte(str)

bytes[1] = 'a'

str = string(bytes) //str == "hallo roc"

• Intercept sub-strings

substr := str[n:m] //截取从索引n到m-1的子串

• Traversing strings

//for遍历，此方式只能遍历存放ASCII

//编码的字符串，比如中文就不行

for i := 0; i < len(str); i++ {

//... = str[i]

}

//for-range遍历，此方式可以遍历Unicode

//编码的字符串，不担心乱码

for index, char := range str {

fmt.Printf("%d %c\n",index,char)

}

• Calculating string Lengths

//字符串中字符全为ASCII中的字符

len(str)

//字符串中含非ASCII的Unicode字符

utf8.RuneCountInString(str)

• Connection string

The quickest notation:

var buf bytes.Buffer

buf.WriteString("hello ")

buf.WriteString("roc")

fmt.Println(buf.String()) //hello roc

There are two different ways:

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

fmt.Println(str)

str := "hello"

str += "roc"

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