Perimeter = function (rect)
{
    return 2 * (rect.width + rect.height);
}
Calculates the perimeter of a Rectangle.

@function Phaser.Geom.Rectangle.Perimeter
@since 3.0.0

@param {Phaser.Geom.Rectangle} rect - The Rectangle to use.

@return {number} The perimeter of the Rectangle, equal to `(width * 2) + (height * 2)`.