Filter vs Map in Kotlin

In this article, we are going to discuss the concepts of Filter and Map in Kotlin using the following code snippets. Suppose we have a list of integer elements and we want to retrieve only the elements as per our requirement:

Now, we are only interested in the elements which are less than 4, then here filter will be useful:

The output of the above code will be:

1
2
3

But when it comes to transforming the elements in the list, Map plays a vital role in that. Suppose we want to convert each element in the list into the square of themselves:

Output:

1
4
9
16
25

As we can see above all the elements have been transformed into the square of themselves.

This is the main difference between Filter and Map in Kotlin.

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