how to store data from callback function

i tried to store data in a variable and return the result from function but I'm not getting data from function if I console.log inside callback function I'm getting data but not outside

here is the code

const ReadingTtlFile = () => {
    let quadData = [];
    let prefixData = [];
    parser.parse(currentQueryData, (error, quad, prefixes) => {

      let result = [];
      if (quad) {
        result.push(quad);
      } else {
        // console.log("# That's all, folks!", prefixes);
        prefixData.push(prefixes);
      }

      quadData.push(result);
    });

    return [...quadData];
  };
  let ttlData = ReadingTtlFile();

console.log(ttlData)
//here I'm getting undefined