Ask HN: What topics/subjects are worth learning for a new software engineer?

Re:Ask HN: What topics/subjects are worth learning for a new... by Jare on Monday September 17, 2018 @05:11AM (#18004278)

This is a terrible idea. A rectangle by definition has width and height independent of each other. A square does not fit that description and thus is not a rectangle.

Even if you did something like implementing the square's size as an average of the underlying rectangle's width and height, which would apparently support both classes correctly, you will get in trouble with the semantics or with other, less "fakeable" properties of these objects.

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Re:Ask HN: What topics/subjects are worth learning for a new... by zild3d on Monday September 17, 2018 @12:06PM (#18007177)

> A rectangle by definition has width and height independent of each other.

That's not really true though. Definition is a quadrilateral w/ 4 right angles. Width and height can be dependent or not

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Re:Ask HN: What topics/subjects are worth learning for a new... by jonny_eh on Monday September 17, 2018 @05:08PM (#18010096)

I've never come across this definition. I've always heard that squares are a subset of rectangles, just as rectangles are a subset of parallelograms.

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