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Get integer URL get parameter with JavaScript 11.08.20

call:
  let v  = get_parameters();
  if(Number.isInteger(Number(v['year'])))
  {
    year = v['year'];
  }

function:

function get_parameters(url) {
  if(!url) url = window.location.href;
  let question = url.indexOf("?");
  let hash = url.indexOf("#");
  if(hash==-1 && question==-1) return {};
  if(hash==-1) hash = url.length;
  let query = question==-1 || hash==question+1 ? url.substring(hash) :
  url.substring(question+1,hash);
  var result = {};
  query.split("&").forEach(function(part) {
    if(!part) return;
    part = part.split("+").join(" "); // replace every + with space, regexp-free version                                                                                                                                                                   
    let eq = part.indexOf("=");
    let key = eq>-1 ? part.substr(0,eq) : part;
    let val = eq>-1 ? decodeURIComponent(part.substr(eq+1)) : "";
    let from = key.indexOf("[");
    if(from==-1) result[decodeURIComponent(key)] = val;
    else {
      let to = key.indexOf("]",from);
      var index = decodeURIComponent(key.substring(from+1,to));
      key = decodeURIComponent(key.substring(0,from));
      if(!result[key]) result[key] = [];
      if(!index) result[key].push(val);
      else result[key][index] = val;
    }
  });
  return result;
}

validation:
Number.isInteger(123) //true
Number.isInteger(-123) //true
Number.isInteger(5-2) //true
Number.isInteger(0) //true
Number.isInteger(0.5) //false
Number.isInteger('123') //false
Number.isInteger(false) //false
Number.isInteger(Infinity) //false
Number.isInteger(-Infinity) //false
Number.isInteger(0 / 0) //false

https://www.w3schools.com/jsref/jsref_isinteger.asp

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