syntax

Today I’m sharing some examples of the Scala Option/Some/None syntax. These examples will show how to use an Option for the var fields in a Scala class. Then I’ll show how to set those Option fields, and then get the values from the Option fields.

To get started, we’ll need a little case class to represent an Address:

Scala FAQ: Can you share some examples of the Scala for loop syntax?

Sure. I'm going to start with a comparison to Java for loops, because that's what I was just thinking about.

In Java you might write a for loop like this:

for (int i = 0; i < 10; i++) {
  System.out.println(i);
}

The equivalent for loop in Scala looks like this:

for (i <- 1 to 10) {
  println(i)
}

(The use of parentheses isn't necessary in either example, but most for loops will be longer.)

When you want to create a Play Framework template function, you can find some examples on the Scala Templates page. There you'll find these two examples.

First, assuming you have a Product model defined something like this:

case class Product(var name: String, var price: BigDecimal)

The first template looks like this:

Scala offers a cool feature where you can rename a class when you import it, including both Scala and Java classes. The basic syntax to rename a class on import looks like this:

import scala.collection.mutable.{Map => MMap}

and this:

import java.util.{HashMap => JavaMap}

If all you needed to know, I hope those "rename on import" syntax examples were helpful.

Why rename a class on import?

An interesting question is, "Why would I want to rename a class on import?"

Just a quick note here today on the inline CSS syntax, which I can never remember. To add CSS to your web pages using the inline syntax, just add a style tag to your HTML tag, including your CSS styles within the quotes of the style tag as shown here:

<div style="border-style: dotted; border-color: #ccc;">

The CSS styles you define within your quotes are defined just as you would in an external style sheet, but they are all on one line, as shown in that example.