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DAY 5

Functions


Functions let us wrap up pieces of code so they can be used in lots of places. We can send data into functions to customize how they work, and get back data that tells us the result that was calculated.

Believe it or not, function calls used to be really slow. Steve Johnson, the author of many early coding tools for the Unix operating system, said this:

“Dennis Ritchie (the creator of the C programming language) encouraged modularity by telling all and sundry that function calls were really, really cheap in C. Everybody started writing small functions and modularizing. Years later we found out that function calls were still expensive, and our code was often spending 50% of its time just calling them. Dennis had lied to us! But it was too late; we were all hooked...”

Today you have 11 one-minute videos to watch, and you’ll meet things like variadic functions, throwing errors, and more. Once you’ve watched each video and optionally gone through the extra reading, there’s a short test to help make sure you’ve understood what was taught.

  1. Writing functions
  2. Accepting parameters
  3. Returning values
  4. Parameter labels
  5. Omitting parameter labels
  6. Default parameters
  7. Variadic functions
  8. Writing throwing functions
  9. Running throwing functions
  10. inout parameters
  11. Functions summary

Do you remember the two rules of this series? You’re already being awesome at the first one because you keep coming back for more (you rock!), but don’t forget the second: post your progress online, so you can benefit from all the encouragement.

Have some questions about functions?

Hit Send below to start a virtual conversation with me.

Need help? Tweet me @twostraws!

 

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