Hi everyone,
I'm reading the excellent 'Functionnal programming for OO programmer' and I
encounter an issue understanding how the '=' function works.
We have a 'Triangle' structure defined by a map of 'Point's
so a Triangle is like {:point1 {:x 1 :y 1} :point2 {:x 1 :y 1} :point3 {:x
4 :y 2}}
How does the '=' function actually evaluate the equality between 2 of this
structure ?
(= triangle1 triangle2).
My guess :
(= triangle1 triangle2) is like
(=
{:point1 {:x 1 :y 1} :point2 {:x 1 :y 1} :point3 {:x 4 :y 2}}
{:point1 {:x 2 :y 3} :point2 {:x 1 :y 1} :point3 {:x 4 :y 2}})
then the evaluator might apply (= {:point1 {:x 1 :y 1} :point1 {:x 2 :y
3}), etc for the other points. But this looks like the 'map' function. I
can't recreate the evaluator steps to get the equality between these
values.
Thanks you !
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