Scala program to reverse an array

1. Introduction

Reversing an array is a fundamental operation in computer science and can be used in various algorithms and problem-solving scenarios. Scala, with its fusion of functional and object-oriented programming paradigms, provides multiple ways to reverse an array. Here, we'll look at a straightforward method to achieve this.

2. Program Steps

1. Initialize the Scala environment.

2. Create a sample array.

3. Utilize the reverse method to reverse the elements of the array.

4. Display the original and reversed array.

5. Execute the program.

3. Code Program

object ArrayReverseApp { def main(args: Array[String]): Unit = { // Sample array val numbers = Array(1, 2, 3, 4, 5) // Reverse the array val reversedNumbers = reverseArray(numbers) println(s"Original Array: ${numbers.mkString("[", ", ", "]")}") println(s"Reversed Array: ${reversedNumbers.mkString("[", ", ", "]")}") } def reverseArray(arr: Array[Int]): Array[Int] = { arr.reverse } }

Output:

Original Array: [1, 2, 3, 4, 5] Reversed Array: [5, 4, 3, 2, 1]

Explanation:

1. We define an ArrayReverseApp object as our main program container.

2. Inside the main function, we initialize a sample array named numbers.

3. The reverseArray function is defined to take an array as an input and return its reversed version. For this, it uses the built-in reverse method provided by Scala's Array class.

4. Both the original and reversed arrays are printed to the console using the mkString method, which is a convenient way to convert arrays to strings with custom delimiters.


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