merge

Scala Array FAQ: How do I merge two Arrays or ArrayBuffers?

Solution: Use the ++ method to join two arrays into one new array:

scala> val a = Array(1,2,3)
a: Array[Int] = Array(1, 2, 3)

scala> val b = Array(4,5,6)
b: Array[Int] = Array(4, 5, 6)

scala> val c = a ++ b
c: Array[Int] = Array(1, 2, 3, 4, 5, 6)

ArrayBuffer

Use the same approach to merge two ArrayBuffers into a new ArrayBuffer:

Scala List FAQ: How do I merge Scala Lists?

There are at least three ways to merge/concatenate Scala List instances, as shown in the examples below.

1) The Scala List ::: method

First, you can merge two Scala lists using the ::: method of the List class, as demonstrated here at the Scala command prompt:

A Perl FAQ is "How do you concatenate (merge) two or more strings in Perl?"

Use the "." operator

The short answer is that you use the . operator. Here's a simple example:

$name = "alvin" . " " . "alexander";

Of course I could have also done that like this:

$name = "alvin " . "alexander";

but I wanted to show an example with more than two strings.

I recently ran into a problem where I had about 50 individual HTML documents, with each document was about 2 pages long,  that I wanted to merge into one big HTML document. After merging all of these into one big document, I wanted them to print with their pages numbered 1-100.