No, len() starts counting from 1.
Key takeaways:
String length is essential for various applications, including UI design, text validation, and networking.
Methods:
len()andRuneCountInString()
len(): This returns the number of bytes in a string.
RuneCountInString(): This returns the number of characters in a string.
Understanding how to find the length of a string is a fundamental operation. It is difficult to think of a domain that doesn’t require string length at some point—whether in web development, data science, or user interface development, to name a few. Many applications rely on string length:
Go by Griesemer et al. makes finding the length of a string process straightforward. In Golang, we use the following two methods to find Golang string length:
len()RuneCountInString()len() method to find the length of a stringThe len()function in Golang returns the number of bytes in a string.
len(str)
This method takes a string str as a parameter.
This method returns the length of the string.
The following code demonstrates how to determine Golang string length.
package mainimport("fmt")//Program starts from herefunc main() {//provide the string herevar str = "educative"//calculate lengthvar length = len(str)//display lengthfmt.Println("Length of the string is :", length)}
main() function.str.str as a parameter to the len() method. Next, we assign length to the length variable, which is returned by len().println() function to print the length.RuneCountInString() method to find the length of a stringThe RuneCountInString() method is provided by the utf8 package.
RuneCountInString(str)
This function accepts a string as its parameter.
It returns the actual number of characters in the string.
The following code demonstrates how to determine Golang string length.
package main//import utf8 packageimport ("unicode/utf8""fmt")//Program exection starts herefunc main() {//provide the string herevar str = "educative"//calculate lengthvar length = utf8.RuneCountInString(str)//display lengthfmt.Println("Length of the string is :", length)}
Most of the explanation is the same as for the len() method.
utf8 package.str as a parameter to RuneCountInString(). We assign the output length to the length variable.We have learned two ways to find the length of a string in Golang.
For normal characters, we can use either the len() function or the RuneCountInString() method. However, if the string contains special characters, such as the Black Chess Queen ♛, the len() function will return a length value that represents the number of bytes, not the number of characters. This can be misleading because each special character may occupy multiple bytes. In such cases, it is better to use RuneCountInString(), which accurately counts the number of characters, regardless of how many bytes they occupy.
package main//import utf8 packageimport ("unicode/utf8""fmt")//Program exection starts herefunc main() {//provide the string herevar str = "Black Chess Queen ♛"//calculate lengthvar length = utf8.RuneCountInString(str)//display lengthfmt.Println("Length of the string by RuneCountInString() is :", length)//display lengthfmt.Println("Length of the string by len() is :", len(str))}
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