Memory usage of constructor techniques:

mem_usage.js

Client:

    console.log('BEFORE:', process.memoryUsage());

    var Rectangle = require('./rectangle');
    var rectangles = [];

    for(var i = 0; i < 100000; i++) {
      rectangles.push(new Rectangle(1,2,3,4));
    }

    console.log('AFTER:', process.memoryUsage());


1) Using Rectangle.prototype:

AFTER: { rss: 27656192,
  vsize: 3115016192,
  heapTotal: 24220832,
  heapUsed: 13505152 }


2) Using Rectangle closure:

AFTER: { rss: 44900352,
  vsize: 3127115776,
  heapTotal: 52798592,
  heapUsed: 24463608 }