Scala Programming: Check whether a given character presents in a string between 2 to 4 times

Scala Programming Basic Exercise-23 with Solution

Write a Scala program to check whether a given character presents in a string between 2 to 4 times.

Sample Solution:

Scala Code:

// Define an object named scala_basic
object scala_basic {
  // Define a function named test with a parameter str1 of type String, returning a Boolean
  def test(str1: String): Boolean = {
    // Count the occurrences of the character 'z' in the string and assign it to the variable count_char
    val count_char = str1.count { n => n == 'z' }
    // Check if the count of 'z' is between 2 and 4 (inclusive)
    count_char >= 2 && count_char <= 4
  }
     
  // Define the main method, which is the entry point of the program
  def main(args: Array[String]): Unit = {
    // Print the result of calling test with the argument "frizz"
    println("Result: " + test("frizz"))
    
    // Print the result of calling test with the argument "zane"
    println("Result: " + test("zane"))
    
    // Print the result of calling test with the argument "Zazz"
    println("Result: " + test("Zazz"))
    
    // Print the result of calling test with the argument "false"
    println("Result: " + test("false"))
  }
}

Sample Output:

Result: true
Result: false
Result: true
Result: false

Explanation:

Here is the break down of the said Scala code:

• object scala_basic {: This declares an object named scala_basic.
• def test(str1: String): Boolean = {: This line defines a function named test that takes a parameter str1 of type String and returns a Boolean.
• val count_char = str1.count { n => n == 'z' }: This line counts the occurrences of the character 'z' in the input string str1 and assigns the count to the variable count_char.
• count_char >= 2 && count_char <= 4: This line checks if the count of 'z' is between 2 and 4 (inclusive). If true, the function returns true; otherwise, it returns false.
• }: Closes the test function.
• def main(args: Array[String]): Unit = {: This line defines the main method, which is the entry point of the program. It takes an array of strings (args) as its parameter and returns Unit (similar to void in other languages).
• println("Result: " + test("frizz")): This line calls the "test()" function with the argument "frizz" and prints the result to the console.
• println("Result: " + test("zane")): Another call to the "test()" function with the argument "zane".
• println("Result: " + test("Zazz")): Another call to the "test()" function with the argument "Zazz".
• println("Result: " + test("false")): Another call to the test function with the argument "false".

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