Using extract and inline refactorings

With extract and inline refactorings, you can quickly clean up your code and make it more streamlined or explicit.

Extract a variable

Select and right-click the following code fragment: &User{ ID: 1, Name: "Smith",}.
Navigate to Refactor | Extract | Variable.
Type u as a name for a new variable.

Code snippet:

package main import ( "errors" "fmt" "log" ) type User struct { ID int Name string } func findUser(user string) (*User, error) { if user != "smith" { return nil, errors.New("user not found") } return &User{ ID: 1, Name: "Smith", }, nil } func main() { user, err := findUser("smith") if err != nil { log.Fatalf("could not find user %s\n", "smith") } fmt.Printf("user found: %#v\n", user) }

Extract methods

Select and right-click the following code fragment: &User{ ID: 1, Name: "Smith",}.
Navigate to Refactor | Extract | Method.

Code snippet:

package main import "fmt" type rect struct { width, height int } func main() { r := rect{width: 10, height: 5} perim := 2*r.width + 2*r.height area := r.width * r.height fmt.Println("area: ", area) fmt.Println("perim: ", perim) }

Extract a constant

In the editor, select an expression or declaration of a variable you want to replace with a constant.
Press Ctrl+Alt+C to introduce a constant or select Refactor | Extract | Constant.
By default, GoLand uses the in-place refactoring. To use the dialog for the refactoring, open the Settings dialog (Ctrl+Alt+S) , go to Editor | Code Editing, and select the In modal dialogs refactoring option in the Refactorings area.
Select an expression you want to extract as constant and press Enter. Select the number of occurrences you want to replace and a name you want to use.

Code snippet at GitHub

Extract functions and methods

In the editor, select an expression or its part that you want to extract. You can also place the caret within the expression, in this case GoLand offers you a list of potential code selections.
Press Ctrl+Alt+M or go to Refactor | Extract | Extract Method in the main menu.
Type a method name and press Enter.

Code snippet at GitHub

Last modified: 08 April 2024