What does string mean in go language?

In the Go language, string is a string. Its essence is a [[]byte], so they can be converted to each other. The length of the byte array is the length of the string. Once the value of a string is determined, it cannot be modified.

The environment of this article: Windows 10 system, Go 1.11.2 version, this article is applicable to all brands of computers.

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The essence of Go language String is a []byte, so they can be converted to each other. The length of the byte array is The length of the string.

Result:

a=H b=e str=Mello,World

Once the value of the string is specified, it cannot be modified. If you want to modify it, you can first replace the string with slice.

//当试图去修改str时候 str[0] = 'M'

The following error message will appear:

## Result:

a=H b=e str=Mello,World

rune represents utf8 Character, a rune character consists of one or more bytes.

What is the difference between rune and string length? You can refer to the following example:

Result:

strLen=12 str2ByteSlice=12 str2RuneSlice=8

From the result, we can see

1, the length of the string and the byte slice The length is consistent

2. The length of the string is larger than the length of the rune slice, which means that a Chinese character needs to occupy multiple bytes, here it is 3, so there is the result of str2RuneSlice = 8

Then we can traverse this rune slice and append the following code

Result:

str2RuneSlice[0]=H str2RuneSlice[1]=e str2RuneSlice[2]=l str2RuneSlice[3]=l str2RuneSlice[4]=o str2RuneSlice[5]=, str2RuneSlice[6]=世 str2RuneSlice[7]=界

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