JSFiddle - React, Tailwind, and code Playground

JavaScript

function sum(){
   var total =  Array.prototype.slice.call(arguments).reduce(function(a, b) { 
   return a + b; 
   }, 0);
   return total;
}
console.log(sum(1,2)); // returns 3
console.log(sum(1,2,3)); // returns 6