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# Exercises
These exercises will reinforce your knowledge of manipulating arrays. You will prove yourself that you can write easy to maintain Go programs.
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1. ** [Refactor ](https://github.com/inancgumus/learngo/tree/master/15-project-retro-led-clock/exercises/01-refactor )**
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In this exercise, you will refactor the project to multiple files by moving
all the placeholders. This will make the project easy to maintain down the road.
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2. ** [Set an Alarm ](https://github.com/inancgumus/learngo/tree/master/15-project-retro-led-clock/exercises/02-alarm )**
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You will print " ALARM! " every 10 seconds.
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3. ** [Split Second ](https://github.com/inancgumus/learngo/tree/master/15-project-retro-led-clock/exercises/03-split-second )**
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You will display the split second in the clock, you will need to update the
clock every 1/10th of a second instead of every second.
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4. ** [Ticker ](https://github.com/inancgumus/learngo/tree/master/15-project-retro-led-clock/exercises/04-ticker )**
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This is a HARD EXERCISE. You will slide the clock animation from right-to-left. After this exercise, you will truly feel that you've mastered everything you've learned so far.