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Scala has been created by Martin Odersky and he released the first version in 2003. Narrow transformations are the result of map() and filter() functions and these compute data that live on a single partition meaning there will not be any data movement between partitions to execute narrow transformations. - a vw passat priced at 10,000 ], Scala Programming Basic [ 26 Exercises with Solution ], Scala Programming String [ 46 Exercises with Solution ], Scala Programming Array [ 40 Exercises with Solution ], Scala Programming List [ 24 Exercises with Solution ], CoffeeScript Exercises, Practice, Solution, Twitter Bootstrap Exercises, Practice, Solution, C Programming Exercises, Practice, Solution, C# Sharp Programming Exercises, Practice, Solution, R Programming Exercises, Practice, Solution, SQL Exercises, Practice, Solution - JOINS, SQL Exercises, Practice, Solution - SUBQUERIES, JavaScript basic - Exercises, Practice, Solution, Java Array: Exercises, Practice, Solution, C Programming Exercises, Practice, Solution : Conditional Statement, HR Database - SORT FILTER: Exercises, Practice, Solution, C Programming Exercises, Practice, Solution : String, Python Data Types: Dictionary - Exercises, Practice, Solution, Python Programming Puzzles - Exercises, Practice, Solution, JavaScript conditional statements and loops - Exercises, Practice, Solution, C# Sharp Basic Algorithm: Exercises, Practice, Solution, Python Lambda - Exercises, Practice, Solution, Python Pandas DataFrame: Exercises, Practice, Solution. Problem 10:Let us assume that you two shopping baskets with a bunch of items in each one. Spark persist() method is used to store the DataFrame or Dataset to one of the storage levels MEMORY_ONLY,MEMORY_AND_DISK, MEMORY_ONLY_SER, MEMORY_AND_DISK_SER, DISK_ONLY, MEMORY_ONLY_2,MEMORY_AND_DISK_2` and more. Machine learning Furthermore, and unlike the previous scala practice exercise, you should usean implicit class as opposed to an implicit function to solve this particularproblem set. Write a Scala program to check the largest number among three given integers. You should of course also create a List data structure to store the above-mentioned students. Each of the aforementioned methods will have as input parametera Vehicle type, and will have no return type. James is a secondary school student of 10 years old and whose type should be the SecondarySchoolStudent class. Create another method similar to the above-mentioned, but this particular method should accept an arbitrary integer input parameters as opposed to just one. About us Number literals in set two but not in set one = HashSet(0, 17, 18, 99), Problem 5: Write a Scala program and use an appropriate data structure to represent the following number literal: 99.5, 100.0, 50.0, 55.0, 70.0, 100.0, -1.0. If no students are found matching thisparticular criteria, the recursive function should return false. Favorite snack is chocolate. Privacy policy, STUDENT'S SECTION hdfs dfs -mkdir input hdfs dfs -put ./users.txt input hdfs dfs -put ./transactions.txt input. mazda 3 stock = 49 - a bmw 3 series priced at 20,000 In doing so, you can define, say, a CarUUID class withhas a constructor parameter for the Car type, and implements a uuid method. Note that this is different from the default cache level of RDD.cache() which is MEMORY_ONLY. Adding or updating vehicle = Car(bmw 3 series) Click me to see the sample solution, 21. In doing so,use a case class to represent a Car type that needs to have a name property of typeString, and a price property of type Double. Click me to see the sample solution, 5. Jill is a primary school student of 8 years old and whose type should be the PrimarySchoolStudent class. The VehicleMaker class should have a make() method with a generic return type V - that is, of course,based from and relative to its class type parameter. Using the typesfrom the previous scala exercises - that is, the Donut, VanillaDonut, GlazedDonut, and Pastry classes -try to define a Pastry object that has an upper type bound to the Lollipop type. Output: A - 1 If the string already begins with 'if', return the string unchanged. Found a cupcake item. car uuid = vw golf - 790852193 You can use this method to produce the following output. pencil is required in the classroom. Go to the editor Making two CAR vehicles: Read vehicle = Car(mazda 3 series) The second example foreach(f: (T) Unit): Where unit Iterates all elements in the dataset by applying function f to all elements. The smallest item in the Vector = -98 When you are pasting blocks of code that contain references to classes or static methods and fields that are not yet imported, the IDE automatically inserts the missing import statements. Calculating cost for Chocolate, quantity = 10 Getting familiar with String and basic text literals, Problem 1:Create a Scala program to reverse, and then format to upper case, the given String: "http://allaboutscala.com/scala-exercises Go to the editor - John who is a primary student and is 8 years old. Next, create a class named VehicleInventory with a type parameter constrained to sub-types of the Vehicle type, and adds the features of the VehicleInventory andthe VehicleDatabaseService traits. The action collect() -Return the complete dataset as an Array. Finally, you should output each car's uuid methodas shown below. Shopping Basket One = Cake - Milk - Cheese - Toilet Paper Item 7 of type Int is not valid. Use a List data structure from Scala's collection type to store the above students. Output: Getting vehicle = Car(mazda 3 series) bmw g 310 r bike The uuid method should have an output with the combined car nameand the car name's hashCode. Output: Please avoid copyrighted materials. You should then define a create the following car stock items, and use an appropriatedata structure from Scala's Collection types. Naturally, next, we define the VehicleSystem trait which alsohas a type parameter for all sub-types of Vehicle. "Bob", 13, to shopping cart Spark Cache and Persist are optimization techniques in DataFrame / Dataset for iterative and interactive Spark applications to improve the performance of Jobs. Go to the editor "Tommy", 10, Modify the VehicleMaker class from the previous Scala exercise, and make its constructorargument optional, and do remember that the VehicleMaker had a type parameter with aconstraint to the Vehicle type. Thereafter, create an object, or instance, of the Lollipop type. and as you see you can run this program because you have already loaded the libraries. Output: O.S. Topics: . Scala smoothly integrates the features of object-oriented and functional languages. - Jill who is 10 years old and whose favorite snack is ice cream. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. buying vehicle Bike(honda bike firestorm) With the above objects created, create an object, or instance, of the VehicleInventorySystem,and pass-through the bmw car to the create() method, the mazda car to the read() method,the honda bike to the update() method, and the bmw bike to the delete method. The actually uuid heuristics can be very basic, such as, an output with thecombined car name and the car name's hashCode. Output: Caching or persisting of Spark DataFrame or Dataset is a lazy operation, meaning a DataFrame will not be cached until you trigger an action, we create a file called DatasetRead.scala, Let us create a new file called DataSet1.scala, we can compile the program and we printed the dataset in a single line, Let us create another DataSet, called Datset2.scala. the exit code 0 means that the compilation was done successfully!. Go to the editor As a hint or tip, you should keep in mind that the type parameter for the School classshould make use of Scala's built-in variance features in order to restrict only types and sub-typesof the abstract Student class. Next, use an appropriate data structure to store the above-mentioned students. Scala . The difference to the main method altenative is that the App trait uses the delayed initalization feature. Go to the editor EachStudent type should also have a printName() method with Unit as the return type. Next, create objects, or instances, for the following cars, and bikes: [SecondarySchoolStudent] - name: Jack - age: 15 Write a Scala program to find the number literals that are in the firstdata structure, but not in the other one. Student(James,11) Define a value function that will identify whether a given numeric value is divisible by 2. Go to the editor Number literals in set one but not in set two = HashSet(5, 10, 1, 3) C Scala, an acronym for "scalable language," is a general-purpose, concise, high-level programming language that combines functional programming and object-oriented programming. ; Functional: It is also a functional programming language as every . Getting vehicle = Car(mazda 3 series) Networks Combined number literals = List(99.5, 100.0, 50.0, 55.0, 70.0, 100.0, -1.0, 10, 20, 30, 40, 50) The given position will be in the range 0string length -1 inclusive. CS Organizations More precisely, you will have a base trait for a Vehicletype and with an abstract printName() method. Of course, any instance ofthe VehicleSystem trait will have to, inject, or mixin, VehiclesServices. Problem 14:Write a Scala program and create two Lists data structures as follows: (1) The first Listwill have items named "pencil", "pen", "sharpener", and (2) The second List will have items name"math book", "french book", "english book". , please select source and choose scala version 2.12.12 and press finish and choose the new project in a new window. Go to the editor C++ & ans. With the above classes defined, create two instances of Pastry, one with an upper type bound constraint of VanillaDonut, whereas the other, is bound to the abstract Donut type. Output: so we can include the code in the new file called DataFrame3.scala, and the first lines of the output will be, Let us now read a single file called Dataframe4.scala, after compiling and run this code , the preliminary output is. SQL In addition, this particularmakeSimilarCars() method, as its name implies, should only accept objects that are of the sametypes - for instance, you could pass-through two BmwCar objects, and not a BmwCar along witha HondaBike. Its create(), read(), update(), and delete() methods should merely wire in the corresponding methods of the VehicleDatabaseService, such as, addOrUpdate(), get(), and remove(). Odd number between 300 and 340 = You can use whichever data structure that you feel isappropriate for this particular problem. Certificates Scala Programming Language. You are free to use whichever data structure is appropriate to store the above-mentioned items. The first thing that is really important when you want to compile your applications are the libraries needed. Note that the printVehicles() method willhave no return type defined as such. Click me to see the sample solution. Favorite snack is cupcake, name = Jill is 10 years old. If we require to tp add external jars we can follow the following steps for adding external jars in IntelliJ IDEA: Select Project Structure option (CTRL + SHIFT + ALT + S on Windows/Linux, + ; on Mac OS X). Sum for elements in the List = 600, Problem 3:Create a Vector with the following numeric items: 0, 10, 20, 47, -2, 99, -98. For instance, define a base abstract class named Student with a name property of type String,and an age property of type Int. Some times should be hard but we can try. - a bmw 5 series with price of 50,000 and stock of 75 - Jack who is a secondary student and is 11 years old. Solution: Problem 4: Create a Scala program to find the 8th character in the String: "http://allaboutscala". Next, extend the VehicleInventory traitwith a class named VehicleInventorySystem that will, of course, provideimplementation details to the create(), read(), update(), and delete() methods from theVehicleInventory trait. Output:SESICREXE-ALACS/MOC.ALACSTUOBALLA//:PTTH. Finally, you should output each car's uuid methodas shown below. Betterment acheives by reshuffling the data from fewer nodes compared with all nodes by repartition. bmw 3 series stock = 200, Problem11:Write a Scala program to represent a basic car inventory. fire storm bike. Define a trait named VehicleInventory that will define the methods only - that is, without anyimplementations - for typical Create, Read, Update, and Delete (CRUD) methods nsmed create(), read()update(), and delete(). Finally, create an object, or instance, of the VehicleInventorSystem and call the create(), read(), update(), and delete() methods by passing through a "bmw 3 series" car, "mazda 3 series" car, a "honda bike firestorm", and a "bmw bike r 2000". buying vehicle Car(mazda 3 series) a bike whose make is: fire storm bike You will further find the source code for all the Scala practice exercises below at our scala-exercises GitHub repository. name = John is 11 years old. Write a Scala program to check whether two given integer values are in the range 20..50 inclusive. You can configure the IDE to automatically add import statements if there are no options to choose from. - a mazda 3 priced at 15,000 . DS SparkSession it is an entry point to underlying Spark functionality in order to programmatically create Spark RDD, DataFrame and DataSet. Output: I know is very simple but just we were doing only the simple setup. Click me to see the sample solution, 11. Output: If there is nocouponCode parameter, then the total cost for a given CartItem will be basically the associatedprice of the CartItem multiplied by its quantity. Web programming/HTML This particular function will be used to apply thegiven format to the "name" input. Output: It runs on JVM (Java Virtual Machine) and interoperates with existing Java code and libraries. Write a Scala program to find the commonitems between the two shopping baskets. Data Structure Output: vw passat stock = 100 If you do not have Apache Hadoop installed, follow this link to download and install. The output will be partitioned by either numPartitions or the default parallelism level. Update vehicle = Vehicle(bmw car 5 series) Click me to see the sample solution, 24. Let now perform additional manipulations of dataframe created before. Write a Scala program to check whether one of the given temperatures is less than 0 and the other is greater than 100. Output: Send your code (attached with a .zip file) to us at w3resource[at]yahoo[dot]com. Wider transformations are the result of groupByKey() functions and these compute data that live on many partitions meaning there will be data movements between partitions to execute wider transformations. Functions such as map(), mapPartition(), flatMap(), filter(), union() are some examples of narrow transformation. This command loads the Spark and displays what version of Spark you are using. Scala has many reasons for being popular and in demand. Write a Scala program to convert the last 4 characters of a given string in upper case. Next, you should extend - so to speak - the Car typeby having a uuid method, but without modifying the source code of the Car class. When you persist a dataset, each node stores its partitioned data in memory and reuses them in other actions on that dataset. - James who is a secondary student and is 13 years old. String, Problem 17:Write a Scala program and use a case class to represent a CartItem object that hasa name property of type String, a quantity property of type Int, and a price property of typeDouble.

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