49 lines
1.5 KiB
JavaScript
49 lines
1.5 KiB
JavaScript
/** `Object#toString` result references. */
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var boolTag = '[object Boolean]',
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dateTag = '[object Date]',
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errorTag = '[object Error]',
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numberTag = '[object Number]',
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regexpTag = '[object RegExp]',
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stringTag = '[object String]';
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/**
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* A specialized version of `baseIsEqualDeep` for comparing objects of
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* the same `toStringTag`.
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*
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* **Note:** This function only supports comparing values with tags of
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* `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
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*
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* @private
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* @param {Object} object The object to compare.
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* @param {Object} other The other object to compare.
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* @param {string} tag The `toStringTag` of the objects to compare.
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* @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
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*/
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function equalByTag(object, other, tag) {
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switch (tag) {
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case boolTag:
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case dateTag:
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// Coerce dates and booleans to numbers, dates to milliseconds and booleans
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// to `1` or `0` treating invalid dates coerced to `NaN` as not equal.
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return +object == +other;
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case errorTag:
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return object.name == other.name && object.message == other.message;
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case numberTag:
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// Treat `NaN` vs. `NaN` as equal.
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return (object != +object)
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? other != +other
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: object == +other;
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case regexpTag:
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case stringTag:
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// Coerce regexes to strings and treat strings primitives and string
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// objects as equal. See https://es5.github.io/#x15.10.6.4 for more details.
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return object == (other + '');
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}
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return false;
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}
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module.exports = equalByTag;
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