I will take tuple with 4 parameter and 2 of these are primitive type(Int & Double).Ĭase class : case class Trade(symbol: String, exchange: String, qty: Int, price: Double) In absence of Tuple poor man choice was to create class with N number of instance variable and give them proper type, scala has Case class which is based on old school thought. Scala is using fixed number of parameter approach. Serialization overhead due to object type.Mutable unless framework or library generates code or maintain fixed layout objects like (Tuple, Tuple2, Tuple3…).Parameter are of object type so puts memory pressure.This is better than the first one but it also has few issues no types so serialization will be big overhead.parameter are of object type so puts memory pressure on both read and write.and has overhead of array index checking.This is first option that comes to my mind, it is good for flexibility but bad for performance like What are different ways to implement tuple ? Class with object array In this blog i will share dark side of tuple. Nothing comes for free and every thing has some trade off. Nice thing about tuple is you have to only decided on data type of element not the name.Ĭomputer science has 2 hard problem : Cache invalidation and naming things. Elements in tuple can be of different type and very easy to declare like (“something”,1,new Date()) We also reviewed several useful methods and walked through some typical use cases.Tuple is very powerful construct in programming language, it allows to create sequence of finite elements. As well we had gone through different operations that can be performed on a tuple. We introduced the tuple type in Scala and we learned how to create tuples and how to access values inside of tuple objects. We will get values for encryptedUserId and encryptedPassword variables as an output. Now we can call that method and assign variable names to the return values: val (encryptedUserId,encryptedPassword) = getEncryptedCredential("Admin", "XXXXXXXX") def getEncryptedCredential(userId: String, password: String)= This may be preferable instead of using a case class, particularly if we need to return unrelated values. The best place where we can use tuple is, when we want to return multiple values from a method or pass multiple values to a function. Because they aren’t a collection, they don’t have methods like map, filter, etc. Note: Technically, Scala 2.x tuples aren’t collections classes, they’re just a convenient little container. One approach is to access them by element number, where the number is preceded by an underscore, method tuple._i is used to access the ith element of the tuple. Operations on Scala Tuple Access element from tuple Currently there is an upper limit of 22 in the Scala and if we need more, then we will have to use a collection, not a tuple. Tuples can be of type Tuple1, Tuple2, Tuple3 and so on. Thus, the type of (1, “hello world”) is Tuple2. The type of a tuple depends upon the number of elements it contains and the types of those elements. Which is a syntactic sugar for the following- val t = new Tuple2(1, "hello world") An example of a tuple storing an integer, and a string value. Click here to know more about mutability and immutability. A tuples purpose is to combine a fixed and finite number of items together to allow the programmer to pass a tuple as a whole. In Scala, a tuple is a class that gives us a simple way to store heterogeneous items or different data types in the same container.
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