<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
function TableComponent(props){
      const checkboxSearch = () => {
      let tempVar = [[1,2,3],[3,2,1],[4,5,6]];
      //containerID = index of chosen array
      const container = document.getElementById("optionsContainer_"+containerID);
      
      if (searchValue === " ") {
        setUniques(props.unique);
      }
      
      const results = props.unique[containerID].filter((item) => {
        if (item) {
          if (typeof item !== "number") {
            return item.toLowerCase().indexOf(searchValue.toLowerCase()) > -1;
          } else {
            return (
              item.toString().indexOf(searchValue.toString().toLowerCase()) > -1
            );
          }
        }
        return null;
      });

      tempVar[containerID] = results;
      setUniques(tempVar);
      };



return(
uniques.map((item,index) => {
  <child data={item} key={index}/>
})

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
function TableHead(props) {

  return (
    <div id={props.keys[props.index]} className="optionsContainer">
          {props.unique.map((item, key) => {
            return (
          <label key={key}>
            <input
              type="checkbox"
              value={item ? item : "empty"}
            />
              <p>
                {item.toFixed(2)}
              </p>
          </label>
        );
      })}
    </div>
  );
}