Not the answer you're looking for? The entire contents of JavaScript modules are automatically in strict mode, with no statement needed to initiate it. Why typically people don't use biases in attention mechanism? How a top-ranked engineering school reimagined CS curriculum (Ep. Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? Both involve a considerable amount of magical behavior in sloppy mode: eval to add or remove bindings and to change binding values, and arguments syncing named arguments with its indexed properties. Changes generally fall into these categories: Strict mode changes some previously-accepted mistakes into errors. 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 () BCD tables only load in the browser with JavaScript enabled. Compiling a numeric literal (4 + 5;) or a string literal ("John Doe";) in a When I call a method in obj1 object, do I have any way to get my function name (test1) inside of this method, except parsing the source (this.func.toString()) of the 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. Trying to get f.[[Prototype]].caller, Checking the value of a function's caller property. You may have to parse the name though, as it will probably include some extra junk. How to check whether a string contains a substring in JavaScript? Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982023 by individual mozilla.org contributors. Time to refresh this thread by a fresh answer :). How about saving the world? Not the answer you're looking for? For a sloppy mode function, this is always an object: either the provided object, if called with an object-valued this; or the boxed value of this, if called with a primitive as this; or the global object, if called with undefined or null as this. Find centralized, trusted content and collaborate around the technologies you use most. How to change the background color after clicking the button in JavaScript . Or will it be in future plans ECMA6, 7? arguments.callee for strict mode functions is a non-deletable property which throws an error when set or retrieved: Reserved words are identifiers that can't be used as variable names. How to create a pop-up to print dialog box using JavaScript? Confirmed working in Node v16.13.0. Share Improve this answer Follow edited Dec 26, 2013 at 15:03 answered Jul 5, 2011 at 18:18 MD Sayem Ahmed 28.5k 27 111 178 Add a comment 6 In sloppy mode, the last duplicated argument hides previous identically-named arguments.

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