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We will explore 3 ways to combine the elements of multiple arrays into one without any elements getting repeated.Given two or more arrays, write a function that combines their elements into one array without any repetition. It accepts one main parameter i.e the function specifying the testing condition.The **indexOf()** method is used to get the first index at which a given element can be found in an array. Using .reduce() The **.reduce()** method is used to execute a given function on every element within an array until a final value is arrived at. Pretty simple, right?The **.filter()** method is used to create a new array from another array. Dev tutorials explaining the code Improve this sample solution and post your code through Disqus. See the Pen JavaScript - Merge two arrays and removes all duplicates elements - array-ex- 30 by w3resource (@w3resource) on CodePen. Examples might be simplified to improve reading and basic understanding. Produces a duplicate-free version of the array, using === to test object equality. We store this in To start the tests for this challenge, run the command below:The result of our comparison reveals that using the .filter() method is the fastest approach of all three. ... How can remove the duplicate without using property name.like without specify any array obj name .

The new array contains only elements that satisfy the specified condition.

If you like the easy way out, then you most likely searched on Google and downloaded a library that offers such functionality or copied some code snippet to get the job done(which isn’t a crime though ).However, in this article, we will be taking the mostly avoided path of handling matters ourselves. To achieve this, we have to somehow detect the number of arrays provided and extract them individually before merging them into one array without any element repeating itself.Since we want to create a solution that can merge any number of arrays, the first step in solving this challenge is to dynamically detect and extract the arguments(arrays) our function receives and merge them into one.Functions receive values with which they carry out various operations in the form of arguments that are passed to them on call.In like manner, our function receives the arrays to be combined as arguments. Next is using a set, which is 33% slower.A solid understanding of the concepts and techniques highlighted in this article would go a long way in improving how we handle duplicate data in real world applications.We can also use these techniques in cleaning up large data-set for statistical computations and visual representation.As in every other case before, this is often encountered in coding interviews as well.In our consideration of this challenge, we have explored various ways to combine multiple arrays into one without duplicates.We have also determined from our tests on JSPerf that the best performing solution is using the To attain a deeper understanding of the highlighted concepts above, you may use the following links:Top shelf learning. Previous: Write a JavaScript function to fill an array with values (numeric, string with one character) on supplied bounds. This method does not change the existing arrays, but returns a new array, containing the values of the joined arrays.The numbers in the table specify the first browser version that fully supports the method.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:

If you know in advance that the array is sorted, passing true for isSorted will run a much faster algorithm. JavaScript array concat method example. E.g Unlike in the previous challenges we’ve considered, we are to write a function that accepts an infinite number of arguments. If these values match, then this is the first time the element occurs within the array.

Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Definition and Usage. W3Schools is optimized for learning, testing, and training. – vishal ... Get all unique values in a JavaScript array (remove duplicates) 8500. To access these arguments from within the function, JavaScript exposes an array-like object Notice that in order to convert the arguments object to a real array, we directly create an array from it using the The **Array.from()** method creates a new **Array** instance from an array-like or iterable object.ES6 however offers us a cleaner and more concise way to achieve the same result using the The next step in solving this problem is combining the arrays received into one array(still containing duplicates). In the function defined 2 arrays with values and then after assigning the value of added 2 arrays to the new array. While using this site, you agree to have read and accepted our
The concat() method is used to join two or more arrays.. I want to merge these two strings into one string and to remove duplicates in this. Hence, it passes the test and is added to the The **.reduce()** method is used to execute a given function on every element within an array until a final value is arrived at.

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