Anatomy

Let's make a file called hello-world.wall and copy-and-paste verbatim the following snippet of Wall code.

#Hello, world!# =
#Hello, world!#

Now, from the command line or from the Wall Online Interpreter, run wall hello-world.wall. You should see the following result:

Hello, world!

And there we have it. Hello world in Wall.

Compiler

Informally a Wall program consists of assignments and statements separated by newlines. If the last line is not an Assignment, it will return the value of the last line.

The Wall compiler, called wall, reads a Wall program and prints the result to standard out.

Interpreter

For the remainder of the exercises in this guide, we will use the Wall interpreter. The Wall interpreter can be invoked by typing wall on the command line. The same example above can be accomplished as follows:

w> #Hello, world!#
w> #Hello, world!#
Hello, world!