golangHow to use errors
package main
import "errors"
func test(param string) (string, error) {
if param == "" {
return "", errors.New("this is bad")
}
return "<" + param + ">", nil
}
func main() {
res, err := test("")
}ctrl + cpackage maindefault package declaration | import "errors"load lib to work with errors |
errors.New(creates new error object | (string, error)our function will return string result and error |
Usage example
package main
import ( "fmt"; "errors" )
func test(param string) (string, error) {
if param == "" {
return "", errors.New("this is bad")
}
return "<" + param + ">", nil
}
func main() {
res, err := test("")
fmt.Println(err)
res, err = test("tag")
fmt.Println(res)
}output
this is bad
<tag>
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