Implementation
JS

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Other implementations
Types
b := PtInRect(Rect(x1,y1,x2,y2), Point(x,y));
Point = Struct.new(:x, :y)

Rect  = Struct.new(:x1, :y1, :x2, :y2) do
  def contains?(point)
    point.x.between?(x1,x2) && point.y.between?(y1,y2)
  end
end

b = Rect.new(0,0,2,5).contains?(Point.new(0,0))
b = (x1 < x < x2) and (y1 < y < y2)
bool b = x1<x && x<x2 && y1<y && y<y2;