Scala map value check: Validate value presence in a map

Last update on December 21 2024 10:27:16 (UTC/GMT +8 hours)

Write a Scala program to create a map and check if it contains a specific value.

Sample Solution:

Scala Code:

object CheckMapContainsValueExample {
  def main(args: Array[String]): Unit = {
    // Create a map
    var color_map = Map("Red" -> 1, "Green" -> 2, "Blue" -> 3, "Orange" -> 4)
    
    // Print the original map
    println("Original map: " + color_map)
    
    // Check if the map contains a specific value
    val valueToCheck = 3
    val containsValue = color_map.values.exists(_ == valueToCheck)

    // Print the result
    if (containsValue) {
      println(s"The map contains the value '$valueToCheck'.")
    } else {
      println(s"The map does not contain the value '$valueToCheck'.")
    }
  }
}

Sample Output:

Original map: Map(Red -> 1, Green -> 2, Blue -> 3, Orange -> 4)
The map contains the value '3'

Explanation:

In the above exercise,

• First, we create a map "color_map" using the Map constructor and provide key-value pairs.
• To check if the map contains a specific value, we use the values method to obtain a collection of all the values in the map. We then use the exists method on the collection and pass a predicate function that checks if any value is equal to the value we want to check. The exists method returns true if such a value exists, and false otherwise. We store the result in the containsValue variable.
• Finally, we use an if statement to print the result based on whether the map contains the value or not.

Scala Code Editor :

Previous: Verify key existence in a map.
Next: Find the minimum value.