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✏️ Editing: equalByTag.js

/** `Object#toString` result references. */
var boolTag = '[object Boolean]',
    dateTag = '[object Date]',
    errorTag = '[object Error]',
    numberTag = '[object Number]',
    regexpTag = '[object RegExp]',
    stringTag = '[object String]';

/**
 * A specialized version of `baseIsEqualDeep` for comparing objects of
 * the same `toStringTag`.
 *
 * **Note:** This function only supports comparing values with tags of
 * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
 *
 * @private
 * @param {Object} object The object to compare.
 * @param {Object} other The other object to compare.
 * @param {string} tag The `toStringTag` of the objects to compare.
 * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
 */
function equalByTag(object, other, tag) {
  switch (tag) {
    case boolTag:
    case dateTag:
      // Coerce dates and booleans to numbers, dates to milliseconds and booleans
      // to `1` or `0` treating invalid dates coerced to `NaN` as not equal.
      return +object == +other;

case errorTag:
      return object.name == other.name && object.message == other.message;

case numberTag:
      // Treat `NaN` vs. `NaN` as equal.
      return (object != +object)
        ? other != +other
        : object == +other;

case regexpTag:
    case stringTag:
      // Coerce regexes to strings and treat strings primitives and string
      // objects as equal. See https://es5.github.io/#x15.10.6.4 for more details.
      return object == (other + '');
  }
  return false;
}

module.exports = equalByTag;

MR SKB