Make Your Own Words

One of the coolest things about Logo is that you can make your own words that do whatever you want them to do. When you make a word, you can use it in other commands and programs just as if it was part of Logo to begin with.

What if we want to draw a lot of squares? Each time we have to type in:

REPEAT 4 [FD 100 RT 90]

That’s not a whole lot of typing, but wouldn’t it be nice if we could just type:

SQUARE

You can teach Logo what a “SQUARE” is like this:

TO SQUARE
    REPEAT 4 [FD 100 RT 90]
END

Now we can use our new word to make cool new programs. Can you figure out what this does?

REPEAT 36 [SQUARE RT 10]