How to find the length of a string in go language

Methods for finding the string length in Go language: 1. Use the "len()" function to calculate the ASCII string length; 2. Use the "utf8.RuneCountInString()" function to calculate the Unicode string length.

The operating environment of this article: Windows 7 system, Go1.11.2 version, Dell G3 computer.

Recommended tutorial: "go language"

Go language calculates the length of a string - len() and RuneCountInString()

Go language’s built-in function len() can be used to obtain the length of slices, strings, channels, etc. The following code can use len() to get the length of a string.

tip1 := "genji is a ninja"
fmt.Println(len(tip1))
tip2 := "忍者"
fmt.Println(len(tip2))

The program output is as follows:

16
6

len() The return value of the function is of type int, which represents the number of ASCII characters or the byte length of the string.

The 16 in the first line of the output indicates that the number of characters in tip1 is 16.

The 6 in the second line of the output indicates the character format of tip2, that is, the number of characters for "ninja" is 6. However, according to custom, the number of characters for "ninja" should be 2.

The difference here is that Go language strings are all saved in UTF-8 format, and each Chinese character occupies 3 bytes, so use len() to obtain 6 bytes corresponding to two Chinese characters.

If you want to calculate based on the customary number of characters, you need to use the RuneCountInString() function provided by the UTF-8 package in the Go language to count the number of Uncode characters.

The following code shows how to calculate the number of characters in UTF-8.

fmt.Println(utf8.RuneCountInString("忍者"))
fmt.Println(utf8.RuneCountInString("龙忍出鞘,fight!"))

The program output is as follows:

2
11

Generally in games, you need to enter a name when logging in, and the name generally has a length limit. Considering that Chinese people are accustomed to using Chinese as names, it is necessary to detect the length of the string in UTF-8 format.

Summary

The ASCII string length uses the len() function.

Unicode string length uses utf8.RuneCountInString() function.

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