You are given the length and width of a 4-sided polygon. 
	The polygon can either be a rectangle or a square.
	If it is a square, return its area. If it is a rectangle, 
	return its perimeter.

	Note: for the purposes of this kata you will assume that it 
	is a square if its length and width are equal, otherwise it 
	is a rectangle.
				

	area_or_perimeter(6, 10) --> 32
	area_or_perimeter(3, 3) --> 9				

Solution by -

	const areaOrPerimeter = function(l , w) {
		return l == w ? l*w : 2*l + 2*w
		};
				

Try it yourself - CodeWars

	You are given the length and width of a 4-sided polygon. 
	The polygon can either be a rectangle or a square.
	If it is a square, return its area. If it is a rectangle, 
	return its perimeter.

	Note: for the purposes of this kata you will assume that it 
	is a square if its length and width are equal, otherwise it 
	is a rectangle.
				

	area_or_perimeter(6, 10) --> 32
	area_or_perimeter(3, 3) --> 9				

Solution by -

	const areaOrPerimeter = function(l , w) {
		return l == w ? l*w : 2*l + 2*w
		};
				

Try it yourself - CodeWars