Chartjs-Update ChartJS line chart from DynamoDB query

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I wrote a function to check for dates that are already stored in the array and it appears to be working well now.

Here is the function:

var isinArr = function(str){
  for(i=0; i<DateTimeArr.length; i++){
    if(str === DateTimeArr[i]){
      return true;
    }
  }
  return false;
}

And here is the updated chartUpdate() function:

function chartUpdate(params){
  console.log("Querying DynamoDB");
  docClient.query(params, function(err, data){
    if(err) console.log(err, err.stack);
    else{
      data.Items.forEach(function(item){
        if(!isinArr(item.DateTime.toString())){
          DateTimeArr.push(item.DateTime.toString());
          o2readingArr.push(item.o2percent.toString());
        }
      });
    }
  });
}

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