This use case is weak: name the enclosing function! 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. E.g. The "use strict" directive was new in ECMAScript version 5. With strict mode, you can not, for example, use undeclared variables. Maybe if you explain what you're trying to do more broadly the community can propose alternatives. These differences are very subtle differences. Print the content of a div element using JavaScript, JQuery | Set the value of an input text field. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. JavaScript used to silently fail in contexts where what was done should be an error. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: x = 3.14; // This will not cause an error. Note though that it may fail if called from an anonymous function. Set a default parameter value for a JavaScript function. names in strict mode. Strict mode isn't just a subset: it intentionally has different semantics from normal code. Why not just write. get the current function name in javascript - Stack Overflow I've moved code around and forgotten to update the hard-coded function names. What was the actual cockpit layout and crew of the Mi-24A? The "use strict" directive can only be applied to the body of functions with simple parameters. How to display error without alert box using JavaScript ? JavaScript sometimes makes this basic mapping of name to variable definition in the code impossible to perform until runtime. This is a good part of the language being strict about throwing errors: it leaves room for future semantic changes. How to add options to a select element using jQuery? 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. javascript - How to get function name in strict mode [proper way 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. Looking for job perks? delete name in strict mode is a syntax error: If the name is a configurable global property, prefix it with globalThis to delete it. Moment.js | Guides Why typically people don't use biases in attention mechanism? Which was the first Sci-Fi story to predict obnoxious "robo calls"? How? How to flip an image on hover using CSS ? If I want to add console.debug(current function name)inside 10 functions , to put actual name within each function is annoying and error prone. Is there a generic term for these trajectories? This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Example 1: This example display currently running function using arguments.callee method. Strict mode forbids setting properties on primitive values. I already mentioned it. Thus for a strict mode function, the specified this is not boxed into an object, and if unspecified, this is undefined instead of globalThis: In strict mode it's no longer possible to "walk" the JavaScript stack. You can only get the name of a function you have a reference to, and you cannot get a reference to an arbitrary function in the call stack. For example I got a function like, I have it in my head section. or a function. So for other coming here the answer is YES and you can just add this line: In strict mode, the value is passed directly without conversion or replacement. How to Make Dark Mode for Websites using HTML CSS & JavaScript ? For strict, arrow, async, and generator functions, accessing the caller property throws a TypeError. For this, just out exact statement "use strict"; at the start of the script that is before any other statements. The names eval and arguments can't be bound or assigned in language syntax. W3Schools is optimized for learning and training. How to change the style of alert box using CSS ? Get certifiedby completinga course today! Checks and balances in a 3 branch market economy, Generate points along line, specifying the origin of point generation in QGIS, Counting and finding real solutions of an equation. To enable strict mode for your javascript code, all you have to do is add the string "use strict" at the beginning of the code. How to get the children of the $(this) selector? This is just awesome! Strict mode - JavaScript | MDN - Mozilla Developer How to pop an alert message box using PHP ? Any reason not to use this in a debugging environment? In sloppy mode, modifying a value in the arguments object modifies the corresponding named argument. , so the answer from @Sayem is only valid if you aren't using strict mode. How can I remove a specific item from an array in JavaScript? Call. JavaScript was designed to be easy for novice developers, and sometimes it gives operations which should be errors non-error semantics. Why was the arguments.callee.caller property deprecated in JavaScript? When a function was called with call or apply, if the value was a primitive value, this one was boxed into an object (or the global object for undefined and null). "use strict" is just a string, so IE 9 will not throw an error even if it does not understand it. Consider: function f(n) { g(n - 1); } function g(n) { if (n > 0) { f(n); } else { stop(); } } f(2); At the moment stop () is called the call stack will be: f (2) -> g (1) -> f (1) -> g (0) -> stop () In sloppy mode, a function declaration inside a block may be visible outside the block and even callable. There are three ways to fail a property assignment: For example, NaN is a non-writable global variable. This is mainly for security reasons and sadly currently there's no alternative for this. Method Invocation There may also be large incompatibilities between implementations and the behavior may change in the future. Thorough testing will need to be performed to make sure nothing breaks. What woodwind & brass instruments are most air efficient? Why do you need to get the name of the function ? var functionName = function() {} vs function functionName() {}. All subsequent code in the script will execute in strict mode. Many implementations used to implement some extension features that make it possible to detect the upstream caller of a function. Assignments which would accidentally create global variables throw an error in strict mode: Strict mode makes assignments which would otherwise silently fail to throw an exception.