You can play around with a near solution in,Caveat emptor: this has not been benchmarked in any way or tested for JS engine optimization compatibility. The other day I had to make a long list of functions where the name was derived from an object key name.
and is the first professional blogger in India. Here the definition of the eval function at w3schools: Dynamic function names in JavaScript.
It hits the performance really bad.I agree. Is it possible to call a function where part of the name is a string that can change? This function has six parameters: id1, content1, id2, content2, id3, content3. However, there is more than one way to name a function.One way is in the declaration, but that name is fixed upon declaration.The same is true for function expressions, where the anonymous function name is derived from the variable name (doesn’t that make it not anonymous though? Since programming is the art of automating stuff, I thought “There has to be a way to have the code do this!”. apache base64 codepen command line functions HTTP iOS java javascript … The JavaScript function that we wrote (changeContent.js) is responsible for updating our content when a link is clicked. So you’d take a minor hit on the first instantiation but then never again.Hello!
Check this out! Above we pass the array to the class and are then able to retrieve values via the "get" functions. This sucks because it makes it difficult to debug (i.e., we can’t easily set break points), so we want to avoid that as much as possible. Thankfully, ECMAScript comes with a.First, the basic code, which will give most of you want you want:The above will create an anonymous function, which when called creates the named function (using the name variable). ):Another is through object literal notation:But, since object literals can have computed properties we can have:And thus we can have a function that creates a function with a dynamically named method and return that method!You may ask, can’t this be done with Object.defineProperty?
Well, not really, you can create functions in the object, but the Function.name value returned will not be what you input to that function, since the function in the property descriptor will be named value.
One candidate for this is the eval function. .Actually this is as bad as eval.
It has some additional properties compared to simple function expression: A named function is created, i.e. When the expression has the name specified, this is a named function expression. Overview. name property holds the function name Enjoy!
Just another tool in the belt, just in case. If you have a nasty debugging situation, sometimes giving names to the functions you are interested in can make things clearer.W3C Workshop on The Future of Off-line Web Applications,Web IDL Conversions when resolving Promises in Gecko,Implementing a Permissions Policy in Gecko,Putting down event infrastructure in Gecko – Marcos Cáceres' blog,http://http://helephant.com/2008/08/23/javascript-anonymous-functions/. That can be useful for recursive functions.var thingsToDoToday = function flyToTheMoon() {.It can also useful for debugging because you can see the function’s name in a call stack. The anonymous function name is 'myFunctionVar', because myFunctionVar variable name is used to infer the function name. By reading this blog you've signed an NDA.Creating a function with a custom name is not something you can do easily out of the box in ECMAScript. The use case is that it’s ever called once.I know this is over a year old, but I came across it while looking for a good way to fix a problem we’re having.Theoretically you could put the return into a cache and any time after the first you’d call the cache instead. Searching on our good friend.Well, the name property of functions is read-only, so that cannot be created and just renamed. It’s certainly not ideal – but it’s a pretty special case.
I can compute the name of the function but do not know which functions are available. The code inside the string is not compiled, because javascript engine have no way to know how will the function look like, so every time you call it it will be parsed again, and again, and again.
:You can basically the start doing cool things from there, like:The above is mega useful for dynamically implementing custom DOM-like interfaces… like shims. So what I need is to execute a function with dynamically computed function name.
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