yield

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.)

I just found some notes from when I first began working with Scala, and I was working with the yield keyword in for loops. If you haven't worked with something like yield before, it will be helpful to know how it works. Here's a statement of how the yield keyword works in for loops, based on the documentation in the book, Programming in Scala: