JAVASCRIPT

create instance method javascript

//to create an instance method on a js class 

class nameOfClass {}

nameOfClass.prototype.nameOfInstanceMethod = function (){}

// now the class 'nameOfClass' has a property called nameOfInstanceMethod inside it's prototype chain

console.dir(nameOfClass) //to view it inside the prototype chain

instance in javascript

var instanceOfOperator = nameOfObject instanceof typeOfObject;