Flatmap scala12/26/2023 We have declared a list of names in our Scala script in this example in the same manner as we did above. Now, we will be presenting to you a Scala script that will produce the exact same output but more efficiently, i.e., by using lesser lines of code or, in other words, by using a single function instead of two. You can clearly see from the program shown above that to achieve the desired functionality we had to run two distinct functions. Finally, the result of the flatten method was displayed on the terminal, i.e., the elements of the map after removing their internal grouping were displayed in the form of distinct characters.Įxample # 2: Creating a Map from a List in Scala and Flattening its Output with the FlatMap Method: Then, the result of the map method was displayed on the terminal, i.e., the elements of the list after getting converted to upper case in the form of a map. First, all the elements of the list were displayed on the terminal. Now, it is time to discuss the output of this script which is shown in the image below. To make an executable file for this Scala script, we used the command given below: After doing this assignment, we used yet another “println” statement to print this output on the terminal. Lastly, we have created another value named “output2” and assigned to it the result of the flatten function. Then, we also wanted to print this output on the terminal. Then, we have created a value named “output1” and assigned to it the result of the function “map.(_.toUpperCase)” that will not only convert the given list to a map but will also convert all of its alphabets to upper case. We have also used the “println” statement for displaying these names on the terminal. We have created a list of names in this Scala script that contains three different names. Notice that in the Scala script shown below, we will be using two different functions, i.e., map and flatten, to achieve the desired functionality. In this example, our goal is to implement a program that can create a map from a list by using the map method of Scala, and then we want to flatten the output of that map by using the flatten method of Scala. Example # 1: Creating a Map from a List in Scala and Flattening its Output without using the FlatMap Method: Now, let us get started by explaining all three of these examples. This will be followed by yet another example in which we will be using the FlatMap method of Scala with a user-defined function. By comparing the two programs and their outputs with each other, you will be able to see how beneficial it is to use the FlatMap method in Scala. After that, we will share another example program that uses the FlatMap method. How to use the FlatMap Method in Scala?įor understanding how the Scala FlatMap method works, we will first show you a program that produces the same results as the FlatMap method would produce. In this guide, we will be talking about the FlatMap method of the Scala programming language that will help us convert a given data structure to a map while flattening its output. Additionally, you might also want to flatten this map, i.e., separate out the elements of this map in the form of distinct characters. You might want to convert a different data structure to a map at times. Therefore, today, we will try to move one step further by introducing you to a very useful function of the Scala programming language, i.e., FlatMap. We have already talked about the usage of maps in Scala.
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