Function apply

Applies fn to both start and end points.

// Line 10,10 -> 20,20
const line = Lines.fromNumbers(10,10, 20,20);

// Applies randomisation to both x and y.
const rand = (p) => ({
 x: p.x * Math.random(),
 y: p.y * Math.random()
});

// Applies our randomisation function
const line2 = apply(line, rand);
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