In this article, we will see the “TypeError: ‘arguments’, ‘callee’, ‘caller’ cannot be accessed in this context”. This error is shown differently in different browsers. For example, the error mentioned above is shown by safari, but, if you are in V8-base or firefox, browser, the error will be “‘caller’, ‘callee’, and ‘arguments’ properties may not be accessed on strict mode functions or the arguments objects for calls to them”.
‘callee’, and ‘caller’ property functions, are the functions, which help access the parent functions.
‘arguments’ property functions, provide access to the arguments, in the most recent call of functions, in the form of an array.
Strict Mode is a feature provided by javascript, to have strict operating context, against the code. For example, if we are not declaring a variable, and only assigning the value ‘a = 10’, then javascript would ignore it, but if you are in a strict mode, then you will get an error, in this line of code.
By, looking at their definitions, we will observe, that, these functions are a threat to data leaks and their code privacy. For example, if one’s knows, how to access the parent functions, in your code, then it could lead to many cyber threats. Due, to this ‘arguments’, ‘caller’, and ‘callee’ have been deprecated, by most browsers. When you are using the strict mode, you cannot, use ‘arguments’, ‘caller’, and ‘callee’, due to the threat of data leak. Actually, there is no issue with the AJAX request.
Example: This code shows an error, as ‘caller’ is called, under the strict mode.
Javascript
'use strict'; function b(){ console.log(b.caller) } b(); |
Output:
To solve this error, we should simply remove the ‘use strict’ mode from the code. As, ‘caller’, ‘callee’, and ‘arguments’, are still accessible in some of the browsers. If you are in ES6, then, the ‘use strict’ mode is in-built into each module, and you cannot remove the ‘use strict’ mode. In such cases, then avoid using the ‘caller’, ‘callee’, and ‘arguments’ property functions, in your code.
Example: The above code is rewritten, without ‘use strict’, and now, no error is shown. The function, b() returns null, as b.caller has no parent function.
Javascript
function b(){ console.log(b.caller) } b(); |
Output:
