Function compareByX

Compares points based on x value. Y value is ignored.

Return values:

• 0: If a.x === b.x
• 1: a is to the right of b (ie. a.x > b.x)
• -1: a is to the left of b (ie. a.x < b.x)

Example: Sorting by x

arrayOfPoints.sort(Points.compareByX);
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