Scala Map: Creating and adding key-value pairs

Last update on December 21 2024 10:24:31 (UTC/GMT +8 hours)

Write a Scala program to create an empty map and add key-value pairs to it.

Sample Solution:

Scala Code:

object AddKeyValuePairsToMapExample {
  def main(args: Array[String]): Unit = {
    // Create an empty map
    var color = Map.empty[String, Int]

    // Add key-value pairs to the map
    color = color + ("Red" -> 1)
    color = color + ("Green" -> 2)
    color = color + ("Blue" -> 3)
    color = color + ("Orange" -> 4)

    // Print the map
    println("Map: " + color)
  }
}

Sample Output:

Map: Map(Red -> 1, Green -> 2, Blue -> 3, Orange -> 4)

Explanation:

In the above exercise,

• First, we create an empty map "color" using the Map.empty method. We declare it as a var (mutable).
• To add key-value pairs to the map, we use the + operator and assign the result back to the "color" variable. This way, the updated map is stored in the same variable.
• Finally, we print the "color" using println.

Scala Code Editor :

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