January 2017
Beginner to intermediate
550 pages
10h 6m
English
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Case study - drawing shapes
Let's finish off this chapter with a more practical example of using inheritance. The task is to be able to calculate the area and the perimeter of different shapes, as well as to draw them, while reusing as much code as possible.
Analysis
Let's have one Shape constructor that contains all the common parts. From there, let's have Triangle, Rectangle, and Square constructors, all inheriting from Shape. A square is really a rectangle with the same length sides, so let's reuse Rectangle when building Square.
In order to define a shape, you'll need points with x and y coordinates. A generic shape can have any number of points. A triangle is defined with three points, a rectangle (to keep it simpler) with one point and the ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.