Function getEdgeY

Returns a point on the edge of rectangle

const r1 = {x: 10, y: 10, width: 100, height: 50};
Rects.getEdgeY(r1, `right`);  // Yields: 10
Rects.getEdgeY(r1, `bottom`); // Yields: 60

const r2 = {width: 100, height: 50};
Rects.getEdgeY(r2, `right`);  // Yields: 0
Rects.getEdgeY(r2, `bottom`); // Yields: 50
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