The "use strict" directive was new in ECMAScript version 5. 14. arguments.callee. Find centralized, trusted content and collaborate around the technologies you use most. object, will throw an error. The guides section is new and still under construction. Method Invocation it's intercepted by a proxy's deleteProperty handler which returns false) property throw in strict mode (where before the attempt would have no effect): Strict mode also forbids deleting plain names. Moment.js | Guides Once enabled, the strict mode affects the execution context, making this to be undefined in a regular function invocation. function functionName (fun) { var ret = fun.toString (); ret = ret.substr ('function '.length); ret = ret.substr (0, ret.indexOf (' (')); return ret; } Note: Using Function.caller is non-standard and arguments.callee is forbidden in strict mode. The actual behavior of the caller property, if it's anything other than throwing an error, is implementation-defined. That's when JS does not have native constants like PHP does with Magic constants @AndyE probably no one pointed it out because once we see a regexp, we enter TL;DR mode and look for other answers ;), Works perfect even for arrow functions, underrated answer. Can I get the name of the currently running function in JavaScript? Ajv options | Ajv JSON schema validator Attempts to delete a non-configurable or otherwise undeletable (e.g. Implicit binding covers most of the use-cases for dealing with the this keyword. How to get GET (query string) variables in Express.js on Node.js? In strict mode, a TypeError is thrown. In strict mode, this is a syntax error. This is why W3C's attempts to deprecate tags like and has failed. what I want is that the alert inside de error scoope shows the function name, in this case "MyFunction" but instead what I get is the error:function. Reconstructing the stack and recursion Note that in case of recursion, you can't reconstruct the call stack using this property. Until ES2015, there was no standard way to get the name of a function. Not the answer you're looking for? How to enforce strict null checks in TypeScript ? Strict mode can be enabled using some directives such as 'use strict'. Theres gotta be a way to do this without using a string, but whatever. In normal JavaScript, a developer will not receive any error feedback assigning values to non-writable properties. How to flip an image on hover using CSS ?
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