export function getFilterFunction()

in src/utils/filter-utils.js [417:452]
32 lines of code
12 McCabe index (conditional complexity)

export function getFilterFunction(field, dataId, filter, layers) {
  // field could be null in polygon filter
  const valueAccessor = data => (field ? data[field.tableFieldIndex - 1] : null);
  const defaultFunc = d => true;

  switch (filter.type) {
    case FILTER_TYPES.range:
      return data => isInRange(valueAccessor(data), filter.value);
    case FILTER_TYPES.multiSelect:
      return data => filter.value.includes(valueAccessor(data));
    case FILTER_TYPES.select:
      return data => valueAccessor(data) === filter.value;
    case FILTER_TYPES.timeRange:
      if (!field) {
        return defaultFunc;
      }
      const mappedValue = get(field, ['filterProps', 'mappedValue']);
      const accessor = Array.isArray(mappedValue)
        ? (data, index) => mappedValue[index]
        : data => timeToUnixMilli(valueAccessor(data), field.format);
      return (data, index) => isInRange(accessor(data, index), filter.value);
    case FILTER_TYPES.polygon:
      if (!layers || !layers.length) {
        return defaultFunc;
      }
      // @ts-ignore
      const layerFilterFunctions = filter.layerId
        .map(id => layers.find(l => l.id === id))
        .filter(l => l && l.config.dataId === dataId)
        .map(layer => getPolygonFilterFunctor(layer, filter));

      return data => layerFilterFunctions.every(filterFunc => filterFunc(data));
    default:
      return defaultFunc;
  }
}