The **`map.contains()` function** in Scala checks if a map contains the specific key sent as a parameter. `map.contains()` returns `true` if the map contains that key. Otherwise, it returns `false`. 

Figure 1 below ﻿shows a visual representation of the `map.contains()` function:

> The following module is required in order to use the function: `scala.collection.mutable.Map`.

# 
## Syntax
```Scala
map_name.contains(key)
```

`map_name` is the name of the map.
## Parameter
The `map.contains()` function requires a `key` in order to check that a specific key-value pair exists in the map.

## Return value
The function returns a boolean value, i.e., `true` if a specific key is present in a map or `false` if it is not present.

## Code
The following code shows how to use the `map.contains()` function in Scala:


import scala.collection.mutable.Map
object Main extends App {
  //creating map with values
  val map = scala.collection.mutable.Map(
    1 -> "Tom",
    2 -> "Alsvin",
    3 -> "Eddie"
  )

  //map_1 elements and length
  println("The map elements: " + map);
  //key 3
  println("The map contains key number 3: " + map.contains(3));

  //key 0
  println("The map contains key number 0: " + map.contains(0));
}

What is the map.contains() method in Scala?

The `map.contains()` function in Scala checks for the presence of a specific key in a map, returning true if found and false otherwise.