Function applyStack

src/core/core.datasetController.js:70–100

(stack, value, dsIndex, options = {})

}

function applyStack(stack, value, dsIndex, options = {}) {
  const keys = stack.keys;
  const singleMode = options.mode === class="st">'single';
  let i, ilen, datasetIndex, otherValue;

  if (value === null) {
    return;
  }

  let found = false;
  for (i = 0, ilen = keys.length; i < ilen; ++i) {
    datasetIndex = +keys[i];
    if (datasetIndex === dsIndex) {
      found = true;
      if (options.all) {
        continue;
      }
      break;
    }
    otherValue = stack.values[datasetIndex];
    if (isFinite(otherValue) && (singleMode || (value === 0 || sign(value) === sign(otherValue)))) {
      value += otherValue;
    }
  }

  if (!found && !options.all) {
    return 0;
  }

  return value;
}

function convertObjectDataToArray(data, meta) {
  const {iScale, vScale} = meta;