const clean_data = datoa

    .filter(({ x, y }) => {

      return (

        typeof x === typeof y &&  // filter out one string & one number

        !isNaN(x) &&              // filter out `NaN`

        !isNaN(y) &&

        Math.abs(x) !== Infinity && 

        Math.abs(y) !== Infinity

      );

    })

    .map(({ x, y }) => {

      return [x, y];             // we need a list of [[x1, y1], [x2, y2], ...]

    });