Hi Richard, thanks for this articles.
What about OLOO? Objects linked without classes at all.

'use strict'const Cow = {  airInLungs: 0,  getAirInLungs() {    return this.airInLungs  },  breathe () {    this.airInLungs = this.lungCapacity  },  moo () {    let output = "m"    let air = this.getAirInLungs()    while (air --> 0) { // The 'goes to' operator        output += "o"    }    this.airInLungs = air    return output  }}const CowFactory = lungCapacity => ({  __proto__: Cow,  lungCapacity});const herd = []for (let i = 0; i < 30000; i++) {  const cow = CowFactory(i);  cow.index = i  herd.push(cow)}console.log(process.memoryUsage())const start = Date.now()herd.map(cow => {  cow.breathe()  cow.moo()})console.log(`Finished mooing in ${(Date.now() - start) / 1000} seconds`)

My results…

➜ class-vs-closures node classes.js
{ rss: 25632768, heapTotal: 11571200, heapUsed: 6076680 }
Finished mooing in 8.192 seconds
➜ class-vs-closures node closures.js
{ rss: 38068224, heapTotal: 29396992, heapUsed: 15660968 }
Finished mooing in 14.56 seconds
➜ class-vs-closures node oloo.js
{ rss: 27602944, heapTotal: 16814080, heapUsed: 6630416 }
Finished mooing in 8.212 seconds

)

    Sergio Adaberto Minutoli

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