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of it. Examples might be simplified to improve reading and learning. In general you want to invoke strict mode because of its benefits to your code's reliability (see @JohnResig article). Consider: At the moment stop() is called the call stack will be: so if you tried to get the stack trace in the stop() function like this: If the caller is a strict mode function, the value of caller is null. As an example, in normal JavaScript, mistyping a variable name creates a new But arguments.callee.name only works in loose mode. Here we make use of an assignment operator and variable to stow the function as an object, then utilizing that variable, we will be capable to invoke the . In strict mode, it is now undefined. Why not just write. Why do you need to get the name of the function ? For strict, arrow, async, and generator functions, accessing the caller property throws a TypeError. This is mainly for security reasons and sadly currently there's no alternative for this. Approach 1: Using arguments.callee method: It refers to the currently executing function inside the function body of that function. In strict mode, any assignment to a non-writable property, a getter-only When a function is called in non-strict mode, this refers to the global object which is a window in the browser and global on Node.js. arguments[i] does not track the value of the corresponding named argument, nor does a named argument track the value in the corresponding arguments[i]. How to print and connect to printer using flutter desktop via usb? Then the answer is there is none, which is why I asked for clarification. Note: Sometimes you'll see the default, non-strict mode referred to as sloppy mode. A leading-zero syntax for the octal is rarely useful and can be mistakenly used, so strict mode makes it a syntax error: The standardized way to denote octal literals is via the 0o prefix. Strict mode makes it easier to write "secure" JavaScript. How to enforce strict null checks in TypeScript ? // Strict mode syntax for entire script. Duplicating a parameter name is not allowed: Writing to a read-only property is not allowed: Writing to a get-only property is not allowed: Deleting an undeletable property is not allowed: The word eval cannot be used as a variable: The word arguments cannot be used as a variable: For security reasons, eval() is not allowed to create