How to define a tuple in Scala?
In Scala, a tuple is a value that contains a fixed number of elements, each with its own type. Tuples are immutable. Tuples are especially handy for returning multiple values from a method. This creates a tuple containing a String element and an Int element.
What is the difference between a map and a tuple?
Maps or hash tables are collections of key value pairs. Tuples are an immutable sequence of values and are used for aggregating values.
How do I convert a list to map in Scala?
In Scala, you can convert a list to a map in Scala using the toMap method. A map contains a set of values i.e. key-> value but a list contains single values.
What is lazy Val in Scala?
Scala provides a nice language feature called lazy val that defers the initialization of a variable. The lazy initialization pattern is common in Java programs. Though it seems tempting, the concrete implementation of lazy val has some subtle issues.
What is the maximum size of tuple in Scala?
Tuple are of type Tuple1 , Tuple2 ,Tuple3 and so on. There is an upper limit of 22 for the element in the tuple in the scala, if you need more elements, then you can use a collection, not a tuple.
What is the difference between list and tuple in Scala?
Lists are mutable(values can be changed) whereas tuples are immutable(values cannot be changed).
Is tuple ordered in Python?
Tuples are an ordered sequences of items, just like lists. The main difference between tuples and lists is that tuples cannot be changed (immutable) unlike lists which can (mutable).
How do you add a value to a map in Scala?
We can insert new key-value pairs in a mutable map using += operator followed by new pairs to be added or updated.
What is Scala collection?
Scala Collections are the containers that hold sequenced linear set of items like List, Set, Tuple, Option, Map etc. Collections may be strict or lazy. The memory is not allocated until they are accessed. Collections can be mutable or immutable.
How to swap elements of a tuple in Scala?
The Tuple.swap method is used to swap the elements of the tuple. The Tuple.toString () method concatenates all the elements of the tuple into a string. For Example type the following code in scala object StringConverstion.scala as A map can be defined as a collection of key/value pairs. Keys are unique but the values need not be unique.
How do I create a Scala project in Eclipse?
Select File → New → Scala Project. Enter the project name and click on finish. Right click on the project and select New Scala object and enter the object name and click on finish. Now enter the code in IDE as shown below.
What is a map in Scala?
A map can be defined as a collection of key/value pairs. Keys are unique but the values need not be unique. Maps are of two types mutable and immutable. The difference between mutable and immutable is that when the object is immutable the object itself cannot be changed. Import scala.collection.mutable.Map to use the mutable map set.
How to use the mutable map set in Scala?
Import scala.collection.mutable.Map to use the mutable map set. By default Scala uses immutable map. Consider an example of map with key as student ids and student names as the value Consider an example for the basic operations on Map. Below is the output produced when executed as Scala application.