The best way to understand anything is to re-write it from scratch on your own

We are gonna do just that. So go grab yourself a 🍺, drop a huge ❤️ and chelax as we dive right into it.

Here's what we already do

functionPerson(name,age){this.name=name;this.age=age;}Person.prototype.describe=function(){console.log(`I am${this.name} ,${this.age} years of age ! `);}constclient=newPerson('Vladimir',32);client.describe();

That outputs ,I am Vladimir, 32 years if age !

Our goal is to change the line that has the new keyword to a more custom one like:

constclient=spawn(Person,'Vladimir',32);

wherespawn is our own function that we create which should substitutenew

functionspawn(constructor,...args){constobj={};Object.setPrototypeOf(obj,constructor.prototype);returnconstructor.call(obj,...args)||obj;}

How spawn works

Since new returns an object, we first create a fresh object each time for a call of spawn and set its prototype.

Now we call the constructor by setting itsthis argument to the fresh object . After this call all the properties in the constructor function will be assigned (for eg: name, age)

Then we check to see if the constructor returns anything and we respect that , so we return whatever it returns (In most cases constructor doesn't return anything and we return the object)

Thanks for reading
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