Scala Map remove() method with example

The remove() method is utilized to remove a key from the map and return its value only.

Method Definition: def remove(key: A): Option[B]

Return Type: It returns the value of the key present in the above method as argument.

Example #1:

// Scala program of remove()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Creating map
        val m1 = scala.collection.mutable.Map("geeks" -> 5,
                                    "for" -> 3, "cs" -> 2)

        // Applying remove method
        val result = m1.remove("for")

        // Displays output
        println(result)

    }
}

Output:

Some(3)

We use mutable map here, as remove method is a member of mutable map.
Example #2:

// Scala program of remove()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {

        // Creating map
        val m1 = scala.collection.immutable.Map("geeks" -> 5,
                                        "for" -> 3, "cs" -> 2)

        // Applying remove method
        val result = m1.remove("for")

        // Displays output
        println(result)

    }
}

Output:

prog.scala:16: error: value remove is not a member of scala.collection.immutable.Map[String, Int]
val result = m1.remove(“for”)
^
one error found

So, if we use immutable map then there is a compile time error.