![]() This article covers the benefits of using set data structure over array data structure in javascript to enhance its performance. Writing faster and more efficient code is always a good practice for developers. While developing systems for a large-scale application, the performance of the system should be very efficient in all domains. For set, it is taking almost the same time as other operations which ensures set operations take constant time to perform. Here at first, we are finding the index of the given element, then performing the delete operation. ![]() Size = 1000000 for ( let i = 0 i < size i ++ ) let res let toDelete = 56420 Īrray deletion is taking 1.09ms but here this is not the actual time for deletion. Then we shall perform different tests on these data structures. We are creating an array and a set with 1000000 elements. Initial setup for extreme performance test on sets and arrays Now let us see a few examples to analyze how fast sets are in javascript. So the size of the sets does not affect the performance of the set collections. But since sets use keys to store elements, most of the operations take constant time O(1). They need O(n) time to complete where n is the size of the array. Most of the operations on javascript arrays, like insert, delete, search, etc are linear-time operations. It will automatically remove the duplicate elements only the unique elements will be there. We insert all elements present in an array into a set without checking any condition, then simply take out all elements from the set. Since sets do not allow duplicate elements, we can remove duplicates by using sets. Storing NaN is not allowed in javascript arrays, whether we can store NaN values inside sets. Similarly inserting an element in an array using push() or unshift() methods are slower than the sets insert operation. ![]() So this operation is also based on an index, which is a slower process. But in the array, we can use the function splice() based on an index of an element. We can delete elements from sets using their values. Which is a slow operation as compared to has() function in sets. To check whether an element is present inside an array, we can use indexOf() or includes() functions of the array. There are a few benefits of using sets so that our code runs faster. And sets do not allow duplications so all elements in the set are unique. In sets, the data elements are ordered based on their key values. On the other hand, sets are keyed-collection. How sets are different than arrays and the benefits of using sets over an arrayĪrrays are indexed collections where each element is associated with a specific index. In this article, we shall focus on some techniques based on Javascript sets to perform certain array-like or collection-based applications which will run faster and the code will also be concise. For that, we follow several methodologies which make our code efficient. If it isn't, use the one you find easiest to read.While writing code, we always try to make our code easier to read, less complex, more efficient, and smaller in size.If it is, then do a benchmark for it using the engine that will be running the script, and use the most performant method.If it occurs only once, ask yourself question 2:.If it occurs many times, and you only want to remove the first reference, use indexOf.If it occurs many times, and you want to remove all references, use filter.How many times is myobject referenced in this.myArray?.The best approach may be situationally based on two things: The second part of your question asked which was best. (If you prefer it as a prototype method, as some people do, here's that as well.) Since this question is specifically about Angular, the gists are in Typescript. It has pretty clear documentation about the differences, so feel free to use it if it helps you at all. For clarity, I've written a little gist that shows overloads of both options side-by-side. Here is the line from filter's documentation that explains it:įilter() calls a provided callback function once for each element inĪnd as chrystian said, filter also returns a new array, whereas splice modifies the array it was called on. ![]() The second method you asked about using filter, will remove every reference to myobject in this.myArray, in the case that you have multiple references to it in the array. The indexOf() method returns the first index at which a given element can be found The first method you wrote, using indexOf, will only splice the first reference to myobject in this.myArray, as it says in the documentation, There are several answers regarding performance, but there is another difference that wasn't explicitly mentioned between the two methods you are asking about: ![]()
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