este paquete nos ayuda a sumar, restar y multiplicar.

calculadoraUdla = {
  sumar:(n1,n2)=>{
      return n1+n2;
    },
    restar:(n1,n2)=>{
      return n1-n2;
    },
    multiplicar:(n1,n2)=>{
      return n1*n2;
    }
};

npm init
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name: (NPM) twj-a-nieto
version: (1.0.0) 
description: Calculadora
entry point: (index.js) 
test command: 
git repository: 
keywords: calculadora
author: Danilo Nieto
license: (ISC) MIT
npm publish