Expected a dict object nuance

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On top of that, because of how the property resolution mechanism works in JavaScript, any change to Object. This opens the door for prototype pollution attacks , which can be a serious security issue for large JavaScript applications.

Fortunately, we can work around this by using Object. When an object's own properties have name collisions with ones on its prototype, it breaks expectations and thus crashes your program. There is a reliability hazard in obj. As a result, we don't know which method is going to get called exactly during runtime. Some defensive programming can be done to prevent this. For example we can "borrow" the "real" hasOwnProperty from Object. That's why there is a newly-added static method Object.

Object doesn't provide adequate ergonomics to be used as a hash map. Many common tasks can't be intuitively performed. Object doesn't come with a handy API to get the size, i. And there are nuances to what constitutes the size of an object:. All the above options take a runtime complexity of O n since we have to construct an array of keys first before we can get its length. We can use the good old for But it reveals inherited enumerable properties:. We can't use for We can use Object.

Finally, the insertion order is infamously not fully respected. In most browsers, integer keys are sorted in ascending order and take precedence over string keys even if the string keys were inserted before the integer keys. There is no easy way to remove all properties from an object, you have to delete each property one by one with the delete operator, which has been historically known to be slow.

However, my benchmarks show that its performance is actually not an order-of-magnitude slower than Map. More on that later. Instead we have to use Object. First of all, unlike Object , which only allows keys that are strings and symbols, Map supports keys of any data type. However if you are using Map to store meta-data for objects, then you should use WeakMap instead to avoid memory leak. But more importantly, Map provides a clean separation between user-defined and built-in program data, at the expense of an additional Map.

Map also provides better ergonomics: A Map is an iterable by default. That means you can iterate a map easily with for There seems to be a common belief among JavaScript community that Map is faster than Object , for the most part. There are people who claimed to see noticeable performance gains by switching from Object to Map.

My experience of grinding LeetCode seems to confirm this belief: LeetCode feeds a huge amount of data as the test cases to your solution and it times out if your solution is taking too long. Questions like this only times out if you use Object , but not on Map. However, I believe just saying " Map is faster than Object " is reductive. There must be some nuance that I wanted to find out myself.

I built a little app to run some benchmarks. Perfectly robust benchmarking is hard, and most of us have never gone through any form of training in either benchmarking or interpreting the results. The more benchmarking I do the more it felt like a story about blind men and an elephant. So take everything I'm saying here about performance with a grain of salt. You'll need to test such changes with your application in a production environment to know for sure if there are actual performance gains from using Map s over Object s.

The app has a table that shows the insertion, iteration, and deletion speed measured on Object and Map. The performances of insertion and iteration are measured in operations per second.

I wrote a utility function measureFor that runs the target function repeatedly until the specified minimal amount of time threshold i. It returns the average number of times such a function is executed per second. As for deletion, I am simply going to measure the time taken for using the delete operator to remove all properties from an objects and compare it with the time with Map. I could use Map. In these three operations, I pay more attention to insertion since it tends to be the most common operation I perform in my day-to-day work.

For iteration performance, it is hard to come up with an all-encompassing benchmarks as there are many different variants of iteration we can perform on a given object. Here I am only measuring the for All keys are randomly generated so we don't hit the inline-cache implemented by V8. I also explicitly convert integer and numeric keys to strings using toString before adding them to objects to avoid the overhead of implicitly casting.

Lastly, before the benchmark begins, there is also a warmup phase for at least ms where we repeatedly create new objects and maps that are discarded right away. I put the code on CodeSandbox if you want to play with it. Here are my findings Because this is about as big as an object can get in JavaScript.

Generally speaking, when keys are non-numeric string, Map outperforms Object on all operations. Accepted Answer. Thank you George. I have a question about embedding fonts but will post it in the pdf Forms forum as a separate question.

Registered: Jul 25 As George Johnson states, your file is most likely messed up beyond repair. Deactivating "Save as… optimizes for fast web view" is definitely one thing you should do anyway when you work with forms, but I don't think that this was the cause of the troubles.

I have experienced such issues when copying fields between document and also between pages. As far as I have experienced, the "safest" way to get fields from one page to another is to use the "duplicate field" functionalitly, and but that could be more voodoo have JavaScript deactivated.

It is known that Acrobat sometimes does not a very good job when cleaning up during a Save as…, but there is not much you can do with it. Max Wyss. I was indeed copying nearly all of the many fields in this form between documents and pages. I cannot deactivate JS as I use it extensively in these forms. I appreciate your reply.

Registered: Feb 23 So it is always a good idea to keep a version -1 copy. Well, the PDF Optimizer can be serious poison for forms anyway, that is indeed true. However, what I did refer to is the "Save as… optimizes for fast web view" setting in the Document tab of the Preferences. Actually, the Fast Web View horrendously slows down forms when viewed under a web browser.

It sounds paradox, but it isn't, as a form consists of many small objects, which are transferred object by object when the "fast web view" option is on. Being Mac-based, it is possible to have two versions of Acrobat running at the same time, without interference.

The other versio Acrobat Pro 9 has JavaScript active, and is used to test any updated version. For Windows, this can be kind of simulated using virtual machines. Thanks again to all of you. This is good information.

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