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Welcome back. Take a look in your calendar and mark this date.

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Today is the day you are crossing over the line,

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from someone who can just write code that does something to being a real programmer,

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someone who can abstract from a bit of code that works on one piece of data,

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to writing a function that will operate on any similar piece of data.

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Today is your day. I hope you'll celebrate in some way,

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have a special treat,

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brag to your friends,

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or at least make a celebratory post in the forums.

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At the end of this lesson,

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you will be able to define functions with appropriate names for formal parameters,

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identify formal parameters and parameter values in a code sample,

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and you'll be able to predict the return value of a function

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given sample parameter values. See you next time.