javascript - Difference between 2 squared numbers -

how add commas in between inputs make function work?

 function square(num) {     var items=str.split("")     return math.abs(num*num - num2*num2)   }   square(4 2); 

you can use

function square(num, num2) {    return math.abs(num*num - num2*num2);  }    console.log(square(4, 2));  console.log(square(2, 4));