Q:

How to extract unique elements from sequences in Scala?

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YasminRadwan26
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2022-07-06
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While storing data elements to a data structure or extracting raw data duplicate data might be included and this data decreases the efficiency of the code. So, eliminating duplicate data or extracting unique elements is important.

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YasminRadwan26
2022-07-06
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We can extract unique elements from sequences in Scala using two methods,

1) Using distinct method

The distinct method is used to extract unique elements from a collection.

Syntax:

    collection_name.distinct

The method returns a collection with unique elements only.

Program to extract unique elements using distinct method

object MyClass {
    def main(args: Array[String]) {
        val seq = Array(10, 20, 80, 10, 50, 10)
        
        printf("Elements of the Array: ")
        for(i <- 0 to seq.length-1)
            print(seq(i)+" ")
        println()
        
        val uniqueSeq = seq.distinct
        
        printf("The unique elements are: ")
        for(i <- 0 to uniqueSeq.length-1)
            print(uniqueSeq(i)+" ")
        println()
    }
}

Output:

Elements of the Array: 10 20 80 10 50 10 
The unique elements are: 10 20 80 50

2) Using toSet method

One more promising solution to the problem is converting the sequence to set. As the set is a collection of all unique elements only all the duplicate elements will be deleted.

Syntax:

    sequence.toSet

The method returns a set with all unique elements.

Program to extract unique elements using set conversion method

object myObject {
    def main(args: Array[String]) {
        val seq = Array(10, 20, 80, 10, 50, 10)
        
        printf("Elements of the Array: ")
        for(i <- 0 to seq.length-1)
            print(seq(i)+" ")
        println()
        
        val set = seq.toSet
        
        print("Elements of the Array when converted to set: ")
        print(set)
    }
}

Output:

Elements of the Array: 10 20 80 10 50 10 
Elements of the Array when converted to set: Set(10, 20, 80, 50)

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