[Dilettante_Pro]

ASK9292,
Найди 10 (а может, и не 10) отличий

function calculateArea(width, length, figure){

	switch (figure){
		case 'triangle':
		return {
			"area": 1/2 * (width*length),
			"figure": figure,
			"input": width,length
		};
		break;
		case 'square':
		
		break;
		case 'rectangle':
		
		break;

		// and etc.
	}
}

var result = calculateArea(3,3,'triangle');
alert(JSON.stringify(result));

И учти замечание от ksa