| --- | |
| title: Simultaneous Assignment | |
| --- | |
| Simultaneous assignment is useful in many cases to make related assignments in a single statement. Sometimes they are required, either because only a single statement is available (e.g. in an if statement) or because the values will change after the statement (e.g. in the case of swap). All values on the right-hand side of the assignment operator are evaluated before the assignment is performed. | |
| Simultaneous assignment in an if statement can improve readability, especially in test functions: | |
| ``` | |
| if got, want := someFunction(...), currTest.Expected; got != want { | |
| t.Errorf("%d. someFunction(...) = %v, want %v", currIdx, got, want) | |
| } | |
| ``` | |
| Swapping two values is also made simple using simultaneous assignment: | |
| ``` | |
| i, j = j, i | |
| ``` | |
| https://go.dev/ref/spec#Assignments |