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Introduction to Scala filter. Scala filter is a method that is used to select the values in an elements or collection by filtering it with a certain condition. The Scala filter method takes up the condition as the parameter which is a Boolean value and returns the result after filtering over that condition.

scala> peeps.filter(_.last == "Flintstone").map(person => person.first) res1: Seq[String] = List(Fred, Wilma) Scala List filter method summary. I hope these filter method …

Scala Seq class: Method examples (map, filter, fold, reduce) By Alvin Alexander. Last updated: August 18, 2021. Summary: This page contains many examples of how to use …

For all the approaches I have used same function signature. def filter[T](predicate: T => Boolean) (seq: Seq[T]) : Seq[T] = {

Jul 7, 2015 · 1. I have a question, I have a Scala Seq of Fruit Objects, where the name member variable of the object is the name of the fruit like. fruits: Seq [Fruit] = List (banana, apple, jackfruit, pineapple, grapes, watermelon, papaya, orange, pomegranate, strawberry) and I have a scala String which contains the name of the fruit separated by comma like. val ilike = "apple, grapes, watermelon, guava".

In addition of the excellent answer of Shadowlands, I would like to bring an intuitive example of the difference between filter and withFilter. Let's consider the following …

Seq ("Apple-fruit", "Banana-fruittoo", "Chocolate-notafruit") .filter (x => Seq ("Apple", "Banana").exists (y => x.contains (y))) // Seq ("Apple-fruit", "Banana-fruittoo") For each item (x) …

final scala.collection.Traversable possibleEndpoints = serverEndpoints.endpoints().filter(func(e->e.expectedHttpVersions().contains("2")));

In the above syntax, we are defining the data type for elements also inside seq. Below we can see one practice example how to assign them. var meseq:Seq[Int] = Seq(20, 40, 60, 80, 100) Scala Seq …

Now it's safe to use like.contains for filtering: scala> fruits.filter(like.contains) res3: Seq[String] = List(pineapple, grapes, ...

I need to filter the above Seq such that it contain only the objects of Fruit I like, that is the result should be, fruits: Seq[Fruit] = List(apple, grapes, watermelon) I tried the Java …

The two keys to using filter are: Your algorithm should return true for the elements you want to keep and false for the other elements. Remember to assign the results of …

The Scala filter method takes up the condition as the parameter which is a Boolean value and returns the result after filtering over that condition. Whatever ...

As shown, filter returns all elements from a sequence that return true when your function/predicate is called. There's also a filterNot method that returns ...

The filter() method is utilized to select all elements of the list which satisfies a stated predicate. ... Return Type: It returns a new list ...

Aug 18, 2021 · Scala Seq class: Method examples (map, filter, fold, reduce) By Alvin Alexander. Last updated: August 18, 2021. Summary: This page contains many examples of how to use the methods on the Scala Seq class, including map, filter, foldLeft, reduceLeft, and many more.

The Scala List class filter method implicitly loops over the List/Seq you supply, tests each element of the List with the function you ...

Remove or select items from a sequence based on their position; Filter elements of a list that respect a given predicate; Remove duplicated items in a ...

def filterPersonsWithEvents (persons: Seq [Person]): Seq [Person] = { persons.filter (sport => { eventRepo.find (person.name) != null }) persons } The problem is …

Jun 27, 2022 · Last updated: June 27, 2022. The Scala List class filter method implicitly loops over the List/Seq you supply, tests each element of the List with the function you supply. Your function must return true or false, and filter returns the list elements where your function returns true. Note: Even though I use a List in these examples, the filter method can be used on any Scala sequence, including Array, ArrayBuffer, List, Vector, Seq, etc.

Scala Seq Methods

Here's some pseudo code: val sources = Seq (Source1, Source2,...) val validOnes: Seq [Source] = sources.filter (_.isValid) I was thinking of some method that would …

This method returns the all the elements of list which satisfiles the given condition. Usage. Below is an example program of showing how to use filter method − ...

The filter () method is utilized to select all elements of the list which satisfies a stated predicate. Method Definition: def filter (p: (A) => Boolean): List [A] Return Type: It …