| /** `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; |