JSFiddle - React, Tailwind, and code Playground

JavaScript

function Count() {
	this.number = 0;
	this.plus = (n) => {
  	this.number += n;
    return this;
  }
  this.minus = (n) => {
  	this.number -= n;
    return this;
  }
  this.result = () => this.number;
};

console.log(new Count().plus(1000).minus(512).plus(1000).result())