Add else statements to True and False Execise

[mbdunn]

The True and False Statements exercise in the Making Choices lesson would be more clear with some else statements to display the results when the value is considered false.
For example:
if [ ]
disp('empty is true')
else
disp('empty array is false')
end

Also, when learning I found the use of "foo" everywhere in examples confusing and frustrating, using a word that means something to people might make it more accessible.

[gcapes]

Thanks for the ideas @mbdunn!
A PR with some else statements would be welcome!

I don't feel too strongly either way about 'foo'. We only have one example of it in this lesson, but it is widely used in programming as a meaningless placeholder for variable and function names, strings etc, precisely because it holds no meaning. See here for further info https://en.wikipedia.org/wiki/Foobar

[mbdunn]

Great thanks! I'll give the PR thing a try.

Good point. I guess giving a bit of background and introducing it while teaching would help because it will be everywhere when they need to look stuff up for themselves after.