Don't cross the streams!
When you have multiple variables to validate, DON'T try to create ifs for every combination of the variables. The code is too hard to write.
Validation
Mortgage payments
Calculate monthly mortgage payments.
Goat fuel
How much goat fuel will Cthulhu need to buy, for a race?
Validation functions
Let's extract validation code to functions, to make it easier to reuse.
Parade length
How long will a parade be?
Party planner
Help plan a dog party
Don't trust user data
Validate and sanitize user data.
Multifield validation
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