2.1 isDivisible created by smillaraaq - https://repl.it/GvFi/2

2.1 isDivisible.js

function isDivisible(num1, num2){
  var output=num1%num2;//console.log(output);
  if(num1===undefined || num2===undefined){
    console.log("argument undefined");
    return null;
  }else if(output===0){
    return true;
  }
  else{
    return false;
  }
}
isDivisible();