js calc index

//zad1
console.log("zad1")
function sumOld(){
  console.log(arguments);
  var x = 0;
  for( i = 0; arguments.length > i; i ++)
    x += arguments[i];
  console.log(x);
}
sumOld(1,2,3,4,5)


//zad2 i 3
console.log("\nzad2 i 3")
const _ = require('lodash');

function sum(){
  var x = true;

  function checkNumber(element, index,array){
    if(!_.isNumber(element)){
      console.log("[" + index + "] " + element + " błędny typ argumentu");
      x = false;
    }
  }

  _.forEach(arguments,checkNumber)
  if(x){
    console.log(_.sum(arguments))
  }
}

sum(1,'xd',3,'ala',5)
sum(1,2,3,4,5)

//zad4
console.log("\nzad4")

const Calculator = require('./calculator.js')

const item1 = new Calculator([1,2,3,4,5])


const item2 = new Calculator ([1,'text',3,{}])

item1.sum();
item1.substract();

item2.sum();
item2.substract();