When you create a custom object, you can override toString() to call a custom method, so that your custom object can be converted to a string value. For example, + returns 1, because its toString() method returns "1", which is then converted to a number.Īll objects that inherit from Object.prototype (that is, all except null-prototype objects) inherit the toString() method. However, because the base valueOf() method returns an object, the toString() method is usually called in the end, unless the object overrides valueOf(). This method is called in priority by string conversion, but numeric conversion and primitive conversion call valueOf() in priority. You rarely need to invoke the toString method yourself JavaScript automatically invokes it when encountering an object where a primitive value is expected. JavaScript calls the toString method to convert an object to a primitive value. Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.Object.prototype._defineGetter_() Deprecated.
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