javascript get current function name in strict mode

• 8 September 2023

It is possible to change each file individually and even to transition code to strict mode down to the function granularity. An example of a function called in strict mode: JavaScript: How to get the caller (parent) function's name I recently had the need to find out the name of the function that was invoking another specific function in a NodeJS code base. Strict mode changes both syntax and runtime behavior. The this keyword refers to the object that var str = callsite.getFunctionName() Inherited from V8 Ajv options | Ajv JSON schema validator How do you get a list of the names of all files present in a directory in Node.js? What is JavaScript Strict mode and how can we enable it ? ?` unparenthesized within `||` and `&&` expressions, SyntaxError: continue must be inside loop, SyntaxError: for-in loop head declarations may not have initializers, SyntaxError: function statement requires a name, SyntaxError: identifier starts immediately after numeric literal, SyntaxError: invalid assignment left-hand side, SyntaxError: invalid regular expression flag "x", SyntaxError: missing ) after argument list, SyntaxError: missing ] after element list, SyntaxError: missing } after function body, SyntaxError: missing } after property list, SyntaxError: missing = in const declaration, SyntaxError: missing name after . It's possible that a test suite doesn't catch this kind of subtle difference. I guess as long as you have a stack trace available from the throw the point is moot. was passed to each function. Not using eval if you don't really need it may be another pragmatic solution. Write "use strict" at the top of JavaScript code or in a function. In older versions of JS you can get it by using arguments.callee.. You may have to parse out the name though, as it will probably include some extra junk. Word order in a sentence with two clauses, Embedded hyperlinks in a thesis or research paper, English version of Russian proverb "The hedgehogs got pricked, cried, but continued to eat the cactus". @ChrisDutrow: Depends on your requirements. Table Of Contents duplicating parameter in regular JS function; duplicating parameter in non strict mode; duplicating parameter in strict mode; How do arrow functions treat duplicate parameters The guides section is new and still under construction. 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. Strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally. It is thus recommended that you enable strict mode on a function-by-function basis (at least during the transition period). When we invoke a method of an object, we use the dot (.) Also, to get only the name of the function, you need to use arguments.callee.name. to accidentally create a global variable. JavaScript code should be executed in Then the answer is there is none, which is why I asked for clarification. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. 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). Asking for help, clarification, or responding to other answers. How to get form data using JavaScript/jQuery? In strict mode, a TypeError is thrown. Strict mode in javascript and its use cases - Grow Together By Sharing What is the difference between call and apply? Does anyone know if there is a way to get JavaScript function name. All browser compatibility updates at a glance, Frequently asked questions about MDN Plus. arguments.callee will give you a reference to the calling function, not a function name in string. // So codes below the line 'use strict' will be executed in strict mode. If fun is in strict mode, both fun.caller and fun.arguments are non-deletable properties which throw when set or retrieved: Similarly, arguments.callee is no longer supported. This syntax has a flow, it isnt possible to blindly concatenate non-conflicting scripts. Beginner kit improvement advice - which lens should I consider? What is the scope of variables in JavaScript? JavaScript program has no side effects. Moreover, arguments.callee substantially hinders optimizations like inlining functions, because it must be made possible to provide a reference to the un-inlined function if arguments.callee is accessed. As we know, if we define functions as properties of objects, they are referred to as methods.If a method uses "this" keyword, it refers to that object and can be used to refer/access the properties of the object.Let's understand its usage with the help of the following . How do you run JavaScript script through the Terminal? Changes generally fall into these categories: Strict mode changes some previously-accepted mistakes into errors. In general you want to invoke strict mode because of its benefits to your code's reliability (see @JohnResig article). JavaScript : Can I get the name of the currently running function in JavaScript? On whose turn does the fright from a terror dive end? of JavaScript. Generally, the function name is defined when we define the function itself, in normal user-defined functions, but in the case of an anonymous function, the function name is not defined. I had to take out the backslash before the, @declan: yep, you're right. Strict mode can be enabled using some directives such as 'use strict'. This use case is weak: name the enclosing function! Strict mode eliminates some JavaScript silent errors by changing them to throw errors. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Can I get the name of the currently running function in JavaScript? The entire concatenation looks strict, the inverse is also true. Introductory Concepts. Do not use it on production sites facing the Web: it will not work for every user. it's read-only) throws a, Deleting a non-deletable property throws a. Not the answer you're looking for? And arguments.callee.caller.name not working either (nodejs v7.5.0). Only concatenating strict and non-strict scripts is problematic. I've moved code around and forgotten to update the hard-coded function names. Fortunately, this careful review can be done gradually down the function granularity. A minor scale definition: am I missing something? Can I general this code to draw a regular polyhedron? How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. You may have to parse out the name though, as it will probably include some extra junk. differently in strict mode. Those previous arguments remain available through arguments, so they're not completely inaccessible. , so the answer from @Sayem is only valid if you aren't using strict mode. VASPKIT and SeeK-path recommend different paths. In strict mode you can no longer reference callee (see the related discussion at Javascript: is the arguments array deprecated?) Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. variable and dies. Still, this hiding makes little sense and is probably undesirable (it might hide a typo, for example), so in strict mode, duplicate argument names are a syntax error: Strict mode forbids a 0-prefixed octal literal or octal escape sequence. // First line inside a .js file 'use strict'; // rest of the script in strict mode): The syntax, for declaring strict mode, was designed to be compatible with How to get the function name from within that function? Javascript: How can I get the name of a function? Btw, I am using VisualStudio Code and havent look at automatic refactoring tools for JavaScript. Copy and paste console.debug(arguments.callee) is more convenient ( I do not need to repeat function name).

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