Functional Programming in Scala (draft version) by Paul Chiusano, Runar Bjarnason

By Paul Chiusano, Runar Bjarnason

Functional programming (FP) is a programming type emphasizing capabilities that go back constant and predictable effects despite a program's kingdom. therefore, sensible code is simpler to check and reuse, easier to parallelize, and no more at risk of insects. Scala is an rising JVM language that gives powerful aid for FP. Its accepted syntax and obvious interoperability with present Java libraries make Scala a great spot to begin studying FP.

Functional Programming in Scala is a significant educational for programmers trying to study FP and use it on the typical company of coding. The ebook publications readers from uncomplicated ideas to complicated themes in a logical, concise, and transparent development. In it, they are going to locate concrete examples and workouts that open up the realm of sensible programming.

buy of the print booklet comes with a proposal of a loose PDF, ePub, and Kindle publication from Manning. additionally to be had is all code from the book.

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Functional Programming in Scala (draft version)

Practical programming (FP) is a programming variety emphasizing capabilities that go back constant and predictable effects despite a program's kingdom. therefore, useful code is less complicated to check and reuse, less complicated to parallelize, and no more liable to insects. Scala is an rising JVM language that provides powerful aid for FP.

Additional resources for Functional Programming in Scala (draft version)

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This function, partial1, takes a value and a function of two arguments, and returns a function of one argument as its result. The name comes from the fact that the function is being applied to some but not all of its required arguments. def partial1[A,B,C](a: A, f: (A,B) => C): B => C The partial1 function has three type parameters, A, B, and C. It then takes two arguments. The argument f is itself a function that takes two arguments of types A and B respectively and returns a value of type C. The value returned by partial1 will also be a function, of type B => C.

Again, the implementation of this function is fully determined by its type signature. EXERCISE 5: Implement the higher-order function that composes two ©Manning Publications Co. We welcome reader comments about anything in the manuscript — other than typos and other simple mistakes. These will be cleaned up during production of the book by copyeditors and proofreaders. forumID=805 35 functions. def compose[A,B,C](f: B => C, g: A => B): A => C If you can exchange a banana for a carrot and an apple for a banana, you can exchange an apple for a carrot.

We'll use program traces like this throughout this book. foldRight(Cons(1, Cons(2, Cons(3, Nil))), 0)((x,y) => x + y) 1 1 1 1 6 + + + + foldRight(Cons(2, Cons(3, Nil)), 0)((x,y) => x + y) (2 + foldRight(Cons(3, Nil), 0)((x,y) => x + y)) (2 + (3 + (foldRight(Nil, 0)((x,y) => x + y)))) (2 + (3 + (0))) ©Manning Publications Co. We welcome reader comments about anything in the manuscript — other than typos and other simple mistakes. These will be cleaned up during production of the book by copyeditors and proofreaders.

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