JSFiddle - React, Tailwind, and code Playground

by Nickolay Ilchenko

JavaScript

alert(sum(1)(2)(7));

function sum(a){

  var currentSum = a;
  
  function f(b){
    currentSum += b;
    return f;
  }
  
  f.toString = function(){ return currentSum; }
  
  return f;
}