Positives:
'world'.toString() // "world"
const example = {}
example.toString() // "[object Object]"
Negatives:
true.toString() // throws TypeError
false.toString() // throws TypeError
Do you know of any other data types that will cause an error when using the .toString() method?
According to the information found in the documentation about the toString() method:
The toString() method is automatically triggered when an object needs to be represented as a text value or when it is referenced in a context where a string is expected. This method is inherited by all objects that are descendants of Object.
If the variable type is not an object, an error will occur.
To avoid this, you can use the code snippet test instanceof Object before making the call.
It's important to note that this code is designed to work with version 1.8.5.
var toString = Object.prototype.toString;
toString.call(undefined) // returns [object Undefined]
toString.call(null) // returns [object Null]
In JavaScript 1.8.5 and later versions, calling toString() on null returns [object Null], while calling it on undefined returns [object Undefined], as specified in the 5th Edition of ECMAScript and subsequent Errata. For more details, refer to Using_toString()_to_detect_object_class.
Each object that inherits from the Object class has a toString method.
Since JavaScript 1.8.5, calling the toString() method on null will return [object Null], and calling it on undefined will return [object Undefined].
To learn more about this topic, you can visit the following link: Click here for more information
The method toString is a property of the Object class, meaning that every non-undefined and non-null type will automatically inherit the method toString.
When attempting to call the toString() method on objects that do not have this method in their prototype chain, an error will be triggered. This can be seen in the following example:
let b = Object.create(null);
b.toString() //TypeError
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