Functions in Action

Review Labs 7 & 8

• Review functions lab
  • lab 7
    • Discuss different strategies for each problem
      • soccer fields, ponds
  • lab 8
    • color-bars
      • copy the if block vs wrap it in a function
    • refactoring from lines.py to more_lines.py
      • A single line can be handled with two while loops
      • zeros or more lines need the trigger pattern
      • Sometimes we need to redesign our approach to handle a fairly simple development
    • Boxes
      • How did you decompose drawing squares?
        • draw_red vs draw_blue_green?
        • draw_square that checks the color and adds an extra block?
      • How did you draw the sides of the square?
        • 4 calls to draw_side?
        • erase the original dot and use while bit.get_color() != color?
      • How did you handle getting passed the colored square without drawing more squares?

• Talk about code reuse

  • Simple functions that embody a generic idea that you can reuse in multiple places
  • go, go_green, turn_around, etc.

• Talk about the "event-stream" pattern

  • Bit moves towards a defined goal and performs certain tasks along the way when it encounters a cue.

• Talk about the "mosaic" pattern

  • A larger task is composed of smaller, iterated pieces
  • Ocean, ponds, soccer-fields

• Talk about preparation

  • Sometimes Bit isn't in the right place for a pattern to start, so move him there first
    • Soccer-fields: move to corner first, then fill the field
    • Ponds: get inside the pond first, then fill it with water

Project 1 - Bit