foreach

If you're interested in the details of the translation scheme of a Scala for loop (for comprehension), here's a quick look at how a for loop is translated into, well, other code.

A simple Scala for loop

In a first example, we'll start with the following Scala class:

class Main {
  def foo { for(i <- 0 to 10) println(i) }
}

Next, I compile this class from the command line like this:

Here's a quick look at how to use the Scala Map class, with a colllection of Map class examples.

The immutable Map class is in scope by default, so you can create an immutable map without an import, like this:

val states = Map("AL" -> "Alabama", "AK" -> "Alaska")

To create a mutable Map, import it first:

Scala Map FAQ: How can I iterate/loop over a Scala Map?

There are several different ways to iterate over a Scala Map, and the method you choose depends on the problem you need to solve.

To get started with our examples, let's create a simple Map we can work with:

PHP array FAQ: How do I iterate (loop) through a PHP array?

Answer: The easiest way to loop through a PHP array is to use the PHP foreach operator. If you have a simple one-dimensional array, like the $argv array which lets you access command line arguments, you can loop through it like this:

Perl hash tutorials FAQ: Can you share some Perl hash tutorials, or Perl hash examples?

I've recently written a number of articles about the Perl hash construct (or "Perl array hash"). In an effort to try to organize the Perl hash tutorials I've written, I've created this article to help link them all together.