Scala List indexOf() method with example

The indexOf() method is utilized to check the index of the element from the stated list present in the method as argument.

Method Definition: def indexOf(elem: A, from: Int): Int

Return Type: It returns the index of the element present in the argument.

Example #1:

// Scala program of indexOf()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {
        // Creating a list
        val m1 = List(3, 6, 2, 9, 21)

        // Applying indexOf method
        val result = m1.indexOf(9)

        // Displays output
        println(result)

    }
}

Output:

3

Example #2:

// Scala program of indexOf()
// method

// Creating object
object GfG
{

    // Main method
    def main(args:Array[String])
    {
        // Creating a list
        val m1 = List(3, 6, 2, 9, 21)

        // Applying indexOf method
        val result = m1.indexOf(3)

        // Displays output
        println(result)

    }
}

Output:

0