Zlob

function Rectangle( x, y, width, height, options ){
  
  this.getCenter = function(){
    return {
      x: x + width/2,
      y: y + height/2
    };
  }
  

Zlob

function Rectangle( x, y, width, height, options ){
  
  this.getCenter = function(){
    return {
      x: x + width/2,
      y: y + height/2
    };
  }
  

Zlob

function Rectangle( x, y, width, height, options ){
  this.x        = x;
  this.y        = y;
  this.width    = width;
  this.height   = height; 
  this.color    = options.color;
  this.text     = options.text;
  
  this.getCenter = function(){

Zlob

function Rectangle( x, y, width, height, options){
  //…
};

//использование
var rectangle = new Rectangle( 10, 10, 100, 150, {  color:’red’,
                                                    //…
                                                    text: ‘Hello!’} );
                                            

Zlob

function Rectangle( options ){
  //…
}

var rectangle = new Rectangle({
    x     : 10,
    y     : 10,
    width : 100,
    height: 150,

Zlob

var x = 10,
    y = 10,
    height = 100,   
    width = 150,
    color = ‘red’;

var rectangle = new Rectangle( x, y, height, width, color );

Zlob

function Rectangle( x, y, width, height, color ){

    //…

};

//использование
var rectangle = new Rectangle( 10, 10, 100, 150, ‘red’ );