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How to print an array in Scala?

Scala | printing an array: Here, we will learn about the declaration of an array, printing of an array in Scala?
Submitted by Shivang Yadav, on May 16, 2020

Array in Scala

In Scala, Array is a data structure that is a collection of elements of same data type.

Creating an array:

The Array keyword is used to create an array in Scala. There are multiple syntaxes to create an array. They are,

    var array_name : Array[data_type] = new Array[data_type(size) 
    var array_name: Array[data_tpye] = new Array(size)
    var array_name = new Array[data_type](size) 
    var array_name = Array(element1, elmenet2, element3, ...)

All the four declarations are valid but the last two are commonly used.

Accessing an element from the array:

To access the element of the array, its index is used.

Syntax:

    array_name[index]

Print Array

There are two methods to print all the elements of the array (print array):

1. Using iteration
2. Using string conversion

1) Printing elements of array using iteration

We can print the elements of the array by integrating over all the elements of the array and then printing each element using their index.

Syntax:

    for(i <- 0 to array_name.length-1)
        print(array_name[i])

Program to print array using iteration

object MyClass {
    def main(args: Array[String]) {
        var score = Array(97, 90, 89, 75, 45, 78, 99)   
        println("Elements of Array are : ")
        for(i <- 0 to score.length-1 )
            print(score(i) + " ")
    }
}

Output:

Elements of Array are : 
97 90 89 75 45 78 99

Explanation:

In the above code, we have created an array of integer values and then use the for loop to iterate over the elements of the array using the print statement.

2) Printing elements of the array using string conversion method

We can print array using the string conversion method, i.e. converting the array to a string using mkString() method.

Syntax:

    array_name.mkString(saperator)

Program to print array using string conversion method

object MyClass {
    def main(args: Array[String]) {
        var score = Array("C", "C++", "Java", "Python", "Scala")   
        var string = score.mkString(" , ")
        println("Elements of Array are :\n" + string)
    }
}

Output:

Elements of Array are :
C , C++ , Java , Python , Scala

Explanation:

In the above code, we have declared an array of strings. We have used the mkString() method to convert the array of string to string and then print it using the print statement.