By Vicenç Torra
This booklet provides an advent to the programming language Scala. It offers it from a practical programming viewpoint. The publication explains with element useful programming and recursivity, and comprises chapters on lazy and keen evaluate, streams, higher-order features (including map, fold, decrease, and aggregate), and algebraic info varieties. The booklet additionally describes the object-oriented points of Scala, as they're a basic a part of the language. additionally, the e-book encompasses a bankruptcy on parallelism in Scala, giving an outline of the actor model.
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Additional resources for Scala: From a Functional Programming Perspective: An Introduction to the Programming Language
F ( f ( f (x1 , x2 ), x3 ), x4 . . , xn ). For example, we can compute the factorial of 10 as follows. reduceLeft((a,b)=>a*b) • reduceRight. This is also similar to foldRight without e0 . 36 2 The Basics of the Language Scala permits to use wildcards in the anonymous function we pass to these higherorder functions. = 0, and (a,b)=>a+b by _+_. Note that in the first case we replace one variable, and in the second case two. The following expressions are valid in Scala and are equivalent to two expressions above.
The expression of the total accumulated value when the initial amount was P (the principal sum) and the total is to be computed for t years at a i nominal interest rate compounded annually is the following: 20 2 The Basics of the Language P(1 + i)t We can write this function in Scala as follows. 025, 5, 1000) We give now the function in currified form and give also an example of its application. 025)(5)(1000) When the function is currified we can define a new function that computes the compound for any value when the interest and the number of years are known.
FoldLeft("")((a,b)=>a+ Map(1->"one",2->"two",3->"three",4->"four",5->"five", 6->"six",7->"seven",8->"eight",9->"nine",0->"zero")(b)+"") • foldRight. Similar to foldLeft but elements are associated on the right. In the case of the sum, both foldLeft and foldRight are equally valid to define the sum. foldRight(0)((a,b) => a+b) • reduceLeft. It is similar to foldLeft but without the initial value e0 . So, it computes: f (. . f ( f ( f (x1 , x2 ), x3 ), x4 . . , xn ). For example, we can compute the factorial of 10 as follows.
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