“Haskell functions can take functions as parameters and return functions as return values. A function that does either of those is called a higher order function. Higher order functions aren’t just a part of the Haskell experience, they pretty much are the Haskell experience.”
“A variable is a named entity that refers to an object. A variable is either a
val or a
var. Both vals and vars must be initialized when defined, but only vars can be later reassigned to refer to a different object.”
As a quick note, if you need some examples of the syntax of how to write a Java method that returns a generic type, I hope these are helpful:
As a quick note, this is how you create a Scala
import scala.collection.mutable.ArrayBuffer var fruits = ArrayBuffer[String]() var ints = ArrayBuffer[Int]()
The key there is that the keyword
new is not required before the
While I’m in the neighborhood, here are some other ways you can work with
Besides having a bad memory, I haven’t been able to work with Scala much recently, so I’ve been putting together this list of
for loop examples.
This page is currently a work in progress, and as of tonight I haven’t tested some of the examples, but ... if you’re looking for some Scala
for loop examples — technically called a
for comprehension or for expression — I hope these examples are helpful.
This image shows how to use color syntax highlighting in the Scala REPL. In short, just start the REPL like this:
$ scala -Dscala.color
Markdown FAQ: How do I create comments in Markdown? Especially comments that won’t appear in the generated output.
Part 1 of my answer is that technically there is no way — or at least no standard way — to create comments in Markdown documents, other than to use HTML comments like this:
This is an excerpt from my forthcoming book on Scala and Functional Programming. It’s an appendix that “explains and explores” Scala’s function syntax.
This is an excerpt from the Scala Cookbook (partially modified for the internet). This is a short recipe, Recipe 19.2, “How to write a Scala method that takes a simple generic type.”
You’re not concerned about type variance, and want to create a Scala method (or function) that takes a generic type, such as a method that accepts a