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This lesson is called songwriting with parameters.

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We're going to be writing some songs here.

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Sometimes the chorus is just a little bit
different each time you sing it.

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Do you remember Old Macdonald Had a Farm?

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The chorus is slightly different for each
animal.

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And on that farm, he had a cow, e-i-e-i-o.

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The small change in each chorus can be shown
using something we call parameters.

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Sometimes a function needs a parameter.

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A parameter is an extra piece of information
you can pass to a function to customize it

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for a special need.

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When you make ice cream sundaes with your
friends, you are using a process similar to

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parameters in a computer program.

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The disk of vanilla ice cream might be the
same for every sundae but when you ask your

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friends which two toppings they'd like, you
could get lots of different combinations.

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Topping is the function name but each type
of topping is a parameter.

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Functions and parameters work together to
make great computer programs and great sundaes

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too.