bootstrap-vue/esm/components/table/helpers/default-sort-compare.js

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import get from '../../../utils/get';
import { isDate, isFunction, isNumber, isUndefinedOrNull } from '../../../utils/inspect';
import stringifyObjectValues from './stringify-object-values'; // Default sort compare routine
//
// TODO: Add option to sort by multiple columns (tri-state per column,
//       plus order of columns in sort)  where sortBy could be an array
//       of objects `[ {key: 'foo', sortDir: 'asc'}, {key:'bar', sortDir: 'desc'} ...]`
//       or an array of arrays `[ ['foo','asc'], ['bar','desc'] ]`
//       Multisort will most likely be handled in mixin-sort.js by
//       calling this method for each sortBy

var defaultSortCompare = function defaultSortCompare(a, b, sortBy, sortDesc, formatter, localeOpts, locale, nullLast) {
  var aa = get(a, sortBy, null);
  var bb = get(b, sortBy, null);

  if (isFunction(formatter)) {
    aa = formatter(aa, sortBy, a);
    bb = formatter(bb, sortBy, b);
  }

  aa = isUndefinedOrNull(aa) ? '' : aa;
  bb = isUndefinedOrNull(bb) ? '' : bb;

  if (isDate(aa) && isDate(bb) || isNumber(aa) && isNumber(bb)) {
    // Special case for comparing dates and numbers
    // Internally dates are compared via their epoch number values
    return aa < bb ? -1 : aa > bb ? 1 : 0;
  } else if (nullLast && aa === '' && bb !== '') {
    // Special case when sorting null/undefined/empty string last
    return 1;
  } else if (nullLast && aa !== '' && bb === '') {
    // Special case when sorting null/undefined/empty string last
    return -1;
  } // Do localized string comparison


  return stringifyObjectValues(aa).localeCompare(stringifyObjectValues(bb), locale, localeOpts);
};

export default defaultSortCompare;