I used strings.Trim() in Golang to trim the first five characters.
However, the last "a" is always gone.
Why is that so?
Example:
sentence := "Kab. Kolaka Utara"
result := strings.Trim(sentence,sentence[:4])
fmt.Println(result)
Result: Kolaka Utar
I expected: Kolaka Utara
Trim returns a slice of the string s with all leading and trailing Unicode code points contained in cutset removed.
sentence[:4] is "Kab." Trim will remove all leading and trailing "k", "a", "b", ".".
Since strings are UTF-8 encoded in Golang for single byte Unicode code points you may use result := sentence[5:]
like this working sample code:
package main
import "fmt"
func main() {
sentence := "Kab. Kolaka Utara"
result := sentence[5:]
fmt.Println(result)
}
output:
Kolaka Utara
and for multibyte Unicode code points like "µµµµ Kolaka Utara" you may use string([]rune(sentence)[5:]), like this working sample code:
package main
import "fmt"
func main() {
sentence := "µµµµ Kolaka Utara"
result := string([]rune(sentence)[5:])
fmt.Println(result)
}
output:
Kolaka Utara
and see Docs:
func Trim(s string, cutset string) string:
Trim returns a slice of the string s with all leading and trailing Unicode code points contained in cutset removed.
and see: Extracting substrings in Go
You should know the precise meaning of "trim" in programming: removing some characters both from the beginning and the end.
And in Golang's strings.Trim, The second argument is a set of characters.
Trim will remove all leading and trailing characters contained in the set.
In your example:
The set is
{"K", "a", ".", "b"};
For "Kab. Kolaka Utara", Trim will remove "Kab." from the beginning and "a" from the end.
So, the actual string you get is " Kolaka Utar" instead of "Kolaka Utar" which has no leading space.
If you just want to "trim" the first five characters, you should use this statement:
sentence = sentence[5:].
If you are sure about how many characters to be trimmed. Use this method.
func main() {
sentence := "Kab. Kolaka Utara"
fmt.Println(sentence)
fmt.Println(sentence[5:len(sentence)])
}
Output :
Value : Kab. Kolaka Utara
Trimed : Kolaka Utara
strings.Trim(s, " ")for spaces only orstrings.TrimSpace(s)for all whitespace.