There are three ways to fail a property assignment: For example, NaN is a non-writable global variable. Which function is used to prevent code running before document loading in jQuery ? outputs "test" (in Chrome, Firefox and probably Safari). 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. Strict mode makes it easier to write "secure" JavaScript. Note: In function calls like f(), this value was the global object. Strict mode forbids setting properties on primitive values. Here we make use of an assignment operator and variable to stow the function as an object, then utilizing that variable, we will be capable to invoke the . 2. In strict mode, this is a syntax error. The JavaScript `this` Keyword + 5 Key Binding Rules Explained for JS For more explanation, you can read the rationale for the deprecation of arguments.callee. Strict mode makes great strides toward treating eval and arguments as keywords. Strict mode prohibits some syntax likely to be defined in future versions of ECMAScript. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You would have to make sure you add that function name twice. We address our most frequently seen support requests here, so it is a great place to check for solutions to any issues you may have. Implicit binding covers most of the use-cases for dealing with the this keyword. Its possible that you are approaching the problem wrong. Therefore, block-scoped function declarations are only explicitly specified in strict mode (whereas they were once disallowed in strict mode), while sloppy mode behavior remains divergent among browsers. Until ES2015, there was no standard way to get the name of a function. How to change the background color after clicking the button in JavaScript . arguments.callee will give you a reference to the calling function, not a function name in string.

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