What is until in scala?

For until. With a for-loop we can also use the “until” keyword. To and until are methods that return an enumeration of numbers. Until() stops one number before the final number. object Program { def main(args: Array[String]): Unit = { // With until, the final number is not included. // …

How do you run a loop in scala?

Using for-loop with Filters In Scala, for-loop allows you to filter some elements from the given collection using one or more if statements in for-loop. Syntax: for(i<- List if condition1; if condition2; if condition3; …) { // code.. }

How do you use a range in scala?

Let’s see how we can create ranges.

2.1. Using Companion Object. We can create a Range by providing the start and end values to the Range.inclusive method.
2.2. Using to and until Methods. We can also create ranges by using the methods to and until: val rangeTo = 1 to 10 rangeTo.toList shouldBe List(1,2,3,4,5,6,7,8,9,10)

How do you break a loop in scala?

Break is used to break a loop or program execution. It skips the current execution. Inside inner loop it breaks the execution of inner loop. In scala, there is no break statement but you can do it by using break method and by importing scala.

What is flatMap scala?

In Scala, flatMap() method is identical to the map() method, but the only difference is that in flatMap the inner grouping of an item is removed and a sequence is generated. It can be defined as a blend of map method and flatten method.

What is scala seq?

Scala Seq is a trait to represent immutable sequences. This structure provides index based access and various utility methods to find elements, their occurences and subsequences. A Seq maintains the insertion order.

Should you use loops in Scala?

Learning loops to get familiar with Scala is bad. It’s as if you wanted to learn French but still pronounce the ‘h’. You need to let it go. If loops are one of the first things you learn in Scala, that will validate all the other concepts you might have encountered in other languages.

What is fold in Scala?

The fold function is applicable to both Scala’s Mutable and Immutable collection data structures. The fold method takes an associative binary operator function as parameter and will use it to collapse elements from the collection. The fold method allows you to also specify an initial value.

What is REPL Scala?

The Scala REPL (“Read-Evaluate-Print-Loop”) is a command-line interpreter that you use as a “playground” area to test your Scala code.

What does ++ mean in Scala?

++= can mean two different things in Scala: 1: Invoke the ++= method. In your example with flatMap , the ++= method of Builder takes another collection and adds its elements into the builder. Many of the other mutable collections in the Scala collections library define a similiar ++= method.

What is the difference between map and flatMap?

Both of the functions map() and flatMap are used for transformation and mapping operations. map() function produces one output for one input value, whereas flatMap() function produces an arbitrary no of values as output (ie zero or more than zero) for each input value. Where R is the element type of the new stream.

What is until in scala?