Stacks follow the #key# LIFO: last in, first out #key# principle and are available as both mutable and immutable in Scala.

The **`stack.isEmpty()` function** in Scala tests whether the stack is empty by returning `true` if the stack is empty. Otherwise, it returns `false`. 

The image below shows the visual representation of the `stack.isEmpty` function.

#   
#  Syntax

```scala
stack_name.isEmpty();
// where the stack_name is the name of the stack
```
> The following module is required in order to use the function: `scala.collection.mutable.Stack`
#   
#  Parameters
The `stack.isEmpty` function does not require any parameters.

##  
## Return value

If the stack is empty, the `stack.isEmpty` function returns `true`. Otherwise, it returns `false`.


##  
## Code
The following code shows how to use the `stack.isEmpty` function.


import scala.collection.mutable.Stack
object Main extends App {
  //filled stack
  var stack_1 = Stack[Int]()
  stack_1.push(0);
  stack_1.push(2);
  stack_1.push(5);
  stack_1.push(3);
  stack_1.push(1);
  println("Stack_1 is empty: " + stack_1.isEmpty);

  //empty stack
  var stack_2 = Stack[Int]()

  println("Stack_2 is empty: " + stack_2.isEmpty);

}

What is stack.isEmpty in Scala?

Tests if a Scala stack is empty, returning true if it is, otherwise false.