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# Collapse/Expand Local Function

• 2 minutes to read

Collapses a local function body onto a single line and vice versa. Single-line local functions make your code compact.

## Availability

Available when the caret is at the beginning of a local function declaration or in the local function name. The local function body should consist of a single statement.

## How to Use

1. Place the caret in the name of a local function. The local function body should contain a single statement.
##### NOTE

The blinking cursor shows the caret’s position at which the Code Formatter is available.

``````class Project {
int Fibonachi(int n) {
if (n < 0)
throw new ArgumentOutOfRangeException(nameof(n), "n must be greater than or equal to zero.");
return Fib(n);

int │Fib(int n) {
return n < 2 ? n : Fib(n - 1) + Fib(n - 2);
}
}
}
``````
1. Press the Ctrl + . or Ctrl + ~ shortcut to invoke the Code Actions menu.

2. Select Collapse Local Function (Expand Local Function if you want to expand a local function) from the menu.

After execution, the Code Formatter removes the line breaks and converts the local function to a single-line form or expands the local function to a multiple-line form.

The code below shows the collapsed local function.

``````class Project {
int Fibonachi(int n) {
if (n < 0)
throw new ArgumentOutOfRangeException(nameof(n), "n must be greater than or equal to zero.");
return Fib(n);

int Fib(int n) { return n < 2 ? n : Fib(n - 1) + Fib(n - 2); }
}
}
``````