Extending object

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Testing in
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Spread
function getParams(marker, query_text, level) {
  const params = {
    ...(marker ? { marker } : {}),
    ...(query_text ? { query_text } : {}),
    ...(level || level === 0 ? { level } : {}),
  };

  return params;
}

getParams();
getParams("marker");
getParams("marker", "query_text");
getParams("marker", "query_text", 0);
getParams("marker", "query_text", 0);
getParams("marker", "query_text");
getParams("marker");
getParams();
ready
Dot
function getParams(marker, query_text, level) {
  let params = {};
  if (marker) {
    params.marker = marker;
  }
  if (query_text) {
    params.query_text = query_text;
  }
  if (level || level === 0) {
    params.level = level;
  }

  return params;
}



getParams();
getParams("marker");
getParams("marker", "query_text");
getParams("marker", "query_text", 0);
getParams("marker", "query_text", 0);
getParams("marker", "query_text");
getParams("marker");
getParams();
ready
Assign
function getParams(marker, query_text, level) {
  let params = {};
  if (marker) {
    params = Object.assign(params, { marker });
  }
  if (query_text) {
    params = Object.assign(params, { query_text });
  }
  if (level || level === 0) {
    params = Object.assign(params, { level });
  }

  return params;
}


getParams();
getParams("marker");
getParams("marker", "query_text");
getParams("marker", "query_text", 0);
getParams("marker", "query_text", 0);
getParams("marker", "query_text");
getParams("marker");
getParams();
ready

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