Connect and share knowledge within a single location that is structured and easy to search. You need something like this if you want the arguments of MyFunction(): You can't do better than reliably, since that function has almost nothing to do with the error handler: The error handler can very possibly have been created in another context entirely, one enclosing MyFunction, or passed into it etc. Why doesnt a Javascript return statement work when the return value is on a new line. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.4.21.43403. As noted this applies only if your script uses "strict mode". Why this gets undefined in high order functions in Javascript? With the introduction of computed property names, making duplication possible at runtime, this restriction was removed in ES2015. arguments objects for strict mode functions store the original arguments when the function was invoked. Just call console.trace() and Firebug will write a very informative Its possible that you are approaching the problem wrong. This is why W3C's attempts to deprecate tags like and has failed. Solution 1. How do I include a JavaScript file in another JavaScript file? If the object is not specified, functions in strict mode 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 () The entire contents of JavaScript modules are automatically in strict mode, with no statement needed to initiate it. Logging and debugging have different use and often logging is more productive over the time (. It does not refer to the MyFunction's arguments object. Use //# instead, TypeError: can't assign to property "x" on "y": not an object, TypeError: can't convert BigInt to number, TypeError: can't define property "x": "obj" is not extensible, TypeError: can't delete non-configurable array element, TypeError: can't redefine non-configurable property "x", TypeError: cannot use 'in' operator to search for 'x' in 'y', TypeError: invalid 'instanceof' operand 'x', TypeError: invalid Array.prototype.sort argument, TypeError: invalid assignment to const "x", TypeError: property "x" is non-configurable and can't be deleted, TypeError: Reduce of empty array with no initial value, TypeError: setting getter-only property "x", TypeError: X.prototype.y called on incompatible type, Warning: -file- is being assigned a //# sourceMappingURL, but already has one, Warning: unreachable code after return statement. Moment.js | Guides Using the function.caller Property In this approach, we will use the function.caller property in JavaScript. The names eval and arguments can't be bound or assigned in language syntax. But arguments.callee.name only works in loose mode. inspect them further. Connect and share knowledge within a single location that is structured and easy to search. object, will throw an error. How to jQuery : Can I get the name of the currently running function in JavaScript? This strict context prevents certain actions from being taken and throws more exceptions. The fact that you want the function name is probably a good indication that you're thinking about the problem incorrectly. How to Create Dark/Light Mode for Website using JavaScript/jQuery? The strict mode in JavaScript does not allow following things: Use of undefined variables. StackExchange.ready(function(){$.get("https://stackoverflow.com/posts/38435450/ivc/7a17");}); Read More how to monitor the network on node.js similar to chrome/firefox developer tools?Continue, Read More Call AngularJS from legacy codeContinue, Read More How can I add multiple sources to an HTML5 audio tag, programmatically?Continue, Read More webpack: Module not found: Error: Cant resolve (with relative path)Continue, Read More Why doesnt a Javascript return statement work when the return value is on a new line?Continue, Read More How to set time with date in momentjsContinue, The answers/resolutions are collected from stackoverflow, are licensed under. Reconstructing the stack and recursion Note that in case of recursion, you can't reconstruct the call stack using this property. Using Strict mode for a function: Likewise, to invoke strict mode for a function, put the exact statement use strict; (or use strict;) in the functions body before any other statements. This can be done outside the execution of the function, and you can check within the context of the browser console. The statement use strict; instructs the browser to use the Strict mode, which is a reduced and safer feature set of JavaScript. The problem is that what works in today's browser may not work in tomorrow's. Changes generally fall into these categories: Strict mode changes some previously-accepted mistakes into errors. How to use strict mode: Strict mode can be used in two ways, remember strict mode doesn't work with block statements enclosed in {} braces. What is JavaScript Strict mode and how can we enable it ? They occur before the code is running, so they are easily discoverable as long as the code gets parsed by the runtime. Also, this technique cannot work with anonymous functions. Strict mode fixes mistakes that make it difficult for JavaScript engines to perform optimizations: strict mode code can sometimes be made to run faster than identical code thats not strict mode. It is thus recommended that you enable strict mode on a function-by-function basis (at least during the transition period). Strict mode can be enabled using some directives such as 'use strict'. 20 Reasons Why You Need To Stop Being Highly Obsessed With Strict Mode how to monitor the network on node.js similar to chrome/firefox developer tools? Any reason not to use this in a debugging environment? 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.