Chartjs-Multi dataset line graph from table

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You have first to reduce the object by indexing result:

const data = dataset.reduce((accu, item) => {
  if (accu[item.head] == null) accu[item.head] = { data: [], label: item.head };
  accu[item.head].data.push(item.average);
  return accu;
}, {});

then extract values from the result

const result = Object.values(data);

after that you may pad the result .data field to get the right arity

result.forEach(line => {
  while (line.data.length < 2) 
    line.data.unshift(0);
});

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