I read this someplace else before (cannot remember where) but ChatGPT has the reminder.
In Go, it is generally faster to check the length of a string rather than comparing it to an empty string. This is because checking the length is a constant-time operation, whereas comparing the content of the string requires iterating over each character.
For example, consider the following code snippets:
func checkLength(s string) bool {
return len(s) == 0
}
func checkContent(s string) bool {
return s == ""
}
In the checkLength function, the length of the string is directly compared to zero, which is a very fast operation. On the other hand, the checkContent function compares the content of the string to an empty string, which requires iterating over each character in the string.
So, if performance is a concern, it is recommended to use the checkLength approach when checking for an empty string in Go.