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# Change Groovy switch statement

If a Groovy 3 switch statement has a default branch, it must be the last branch. This means that you can no longer place the default branch in any other position except last in the list of branches.

The following does not compile under Groovy 3:

```groovy
switch(yourVariable) {
  default:
    // default action
    break
  case 'a':
    // case a action
    break  
}
```

To correct the above code, place the default branch last:

```groovy
switch(yourVariable) {
  case 'a':
    // case a action
    break
  default:
    // default action
    break  
}
```

Your code will behave exactly the same as all the branches have a `break` statement, so each branch is isolated and doesn’t affect other branches.

## Switch fall-through

As switch fall-through occurs when branches don't have a `break` statement, making it possible to execute multiple branches, not only the one that matches.

Example of switch fall-through:

```groovy
def result = ""
switch(yourVariable) {
  default:
    result += "default "
    // as there is no break statement, "case a" will be executed next
  case 'a':
    result += "a "
    // as there is no break statement, "case b" will be executed next
  case 'b':
    result += "b"
}
```

When `yourVariable` has the value **'a'**, the `result` variable will equal **"a b"**. When `yourVariable` has the value **'b'**, the `result` variable will equal **"b"**. In all other cases, the `result` variable will be equal **“default a b”**.

To make the code compile under Groovy 3, place the default branch last. However, to obtain the same results as the fall-through switch, you must also adjust the rest of the code:

Groovy 3 switch fall-through equivalent:

```groovy
def result = ""
switch(yourVariable) {
  case 'a':
    result = "a b"
    break
  case 'b':
    result = "b"
    break
  default:
    result = "default a b"
    break
}
```