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<h1>Hashset for loop</h1>
<p class="abstract sans">Hashset for loop. Nov 4, 2021 · An example is Earley's algorithm for parsing. Feb 14, 2023 · The following methods will be discussed in this article: Iterate over a set using an iterator. Apr 9, 2024 · The easiest way to use HashSet with a custom type is to derive Eq and Hash. Any help is appreciated. Let’s see a Java example code which illustrates all of the options mentioned above to loop through a HashSet. *; Jun 22, 2020 · As stated above, hashData. – May 5, 2021 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand Aug 13, 2021 · Java 8 onwards you also have an option to use forEach statement to iterate a HashSet in Java. add (index, element) – on average runs in O (n) time. Look here for a reference on IEnumerable. So newMap1 would have 'jab' as the key, newMap2 would have 'hook' as the key and so on. What foreach does behind the scenes is get an enumerator in the HashSet and run through it. @Baldrick I fear it's the latter. Maintains insertion order. The loop is basically: choose a random cell (the hashset holds all possible cells where the random floodfill can spread to, the "fringes") -> fill it -> find adjacent, empty cells and add them to the hashset -> remove filled cell from hashset -> Loop again till hashset is empty. There are mainly 2 ways to loop through Hashset in java. Set: [Java, JavaScript, Python] Iterating over Set using for-each loop: Java, JavaScript, Python, In the above example, we have created a set using the HashSet class. Aug 29, 2014 · 11. Dec 11, 2018 · Hence sorting of HashSet is not possible. public bool Process(int item) max = Math. iterator(), for loop를 이용하여 순회, Iterator를 이용하여 HashSet의 데이터를 순회할 수 있습니다. iterate or loop over the HashSet returned and print the words from it. Oct 18, 2023 · To loop over Set using an improved for loop, there are no special steps to take; you simply use Set as directed by the loop construct. We must also derive PartialEq , which is required if Eq is derived. GetEnumerator Method is used to get an enumerator that iterates through a HashSet object. private int max = int. Dec 28, 2019 · There are several ways using which we can iterate over elements of the HashSet object in Java as given below. Sep 7, 2022 · HashSet Java is a class used to create a collection that uses a hash table for storage. Let’s see each of these ways with an example. } Due to the nature of the HashSet, though, the questions might come out in any order. The for statement consumes the initialization, condition, and increment/decrement in one line thereby providing a shorter, easy-to-debug structure of looping. Feb 20, 2014 · In the case where you hold elements in HashSet and sometimes you need to get elements by index, consider using extension method ToList () in such situations. And you can also store elements in your HashSet using collection initializer. Java HashSet class is a member of Java collections framework. HashSet의 데이터를 순회하는 방법을 소개합니다. Output. Let's look at different ways to iterate a HashSet. long totalMins = 0; final SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss"); Oct 12, 2012 · Just a minor note: it is generally preferred to use ++it instead of it++ in for loops to avoid one extra copy of the iterator. Mar 3, 2021 · There are basically two methods to remove the duplicate entries from the collection: Now Let’s see the implementation using the java program to remove the duplicate entries by using both the methods one by one:-. We will use the hasNext () method and the next () method along with the while loop to iterate through LinkedHashSet elements. Jan 9, 2023 · We can use 2 ways to print HashSet elements: Using the iterator () method to traverse the set elements and printing it. Apr 27, 2021 · This post will discuss how to remove elements from a set in Java based on some specified condition. Step 1 − Create “TLP” class. Where(c => c. Sep 11, 2021 · Loop over HashSet using for loop There are no particular steps to clamping over Pick using enhanced for loop, as you right demand to use the Set as per slot construct as shown below: for (String stocking : setOfStocks){ System. put total inside the for loop to add the minutes. If we want to get objects one by one from the collection then we should go for the cursor. LinkedHashSet(): This constructor is used to create a default HashSet. You can iterate a HashSet using Iterator. Using HashSet. WriteLine("HashSet contents:"); foreach (int number in hashSet) Console. The fastest way to iterate over HashMap is a combination of Iterator and the C style for loop, because JVM doesn't Jan 11, 2010 · There are a few ways: Double brace initialization. The i variable is a temporary limited scope variable, and changing its assignment will have no effect on the contents of the collection being iterated over. HashSet<T>. The iterator() method of Java HashSet class is used to return an iterator of the same elements as the HashSet. ☕ Complete Java c . (Please ignore if I have missed standards and all that stuff, I am trying to understand the concept/implementation). Apr 23, 2014 · Since HashSet<T> is not indexed *, you cannot do it with two loops either. I have tried both equals and == but its not returning true. But my output was an unexpected one. Feb 3, 2016 · Here's a super quick one liner that doesn't require you manually loop, initialising an array with a count will set the size of the array to this, and apply the block to each index. This is a technique which creates an anonymous inner class which has an instance initializer which adds String s to itself when an instance is created: Set<String> s = new HashSet<String>() {{. May 27, 2015 · May 27, 2015 at 12:54. This then adds the 'moduleName' into a hashSet. Convert the array to Stream. out::println); Sep 11, 2021 · In this tutorial, you will learn both ways to traverse over Set or HashSet in Java i. It implements the Set interface. (iter_map_windows #87155) Calls the given function f for each contiguous window of size N over self and returns an iterator over the outputs of f. Oct 29, 2012 · It seems like there are at least one or two very fundamental errors I am making here, because obviously it's not even iterating through the loop like it's supposed to. Questions) {. Jun 4, 2017 · HashMap (HashSet uses HashMap<E,Object>) isn't designed for iterating all items, the fastest way to iterate over HashMap is a combination of Iterator and C style for loop, because JVM doesn't have to call hasNext(). name: String, power: usize, } Dec 28, 2023 · Solution 2: How to iterate a HashSet in Java 8. Well I usually use for loop If I only Jul 26, 2018 · This loop will select every object in the set sequentially and process it as defined in the body. getValue () to get value from the set. It is implemented using a hash table, which is a data structure that maps keys to values. I suspect it has something to do with me using StringBuilder together with HashSets and the Character class, all mashed together while not understanding any of these particularly Dec 12, 2022 · Full tutorial on Sets and HashSets in Java!Thanks to Mailgun for sponsoring this video! Go to https://mailgun. Contains("Criteria") Select modkey. GetEnumerator() return stats. toSet () Collect the formed set using the collect () method. Apr 10, 2024 · For Loops in Python. Remember, LINQ stands for Language INtegrated Query. HashSet<T>(IEnumerable<T>) Initializes a new instance of the HashSet<T> class that uses the default equality comparer for the set type, contains elements copied from the specified collection, and has sufficient capacity to accommodate the number of elements Iterate a hashset in java example program code : HashSet extends AbstractSet and implements the Set interface. Map<Integer, Integer> map = new HashMap<>(); map Nov 8, 2016 · Uses two for loops to put all the words from this (remember, you will be executing this method inside a WordGroup object) and the parameter WordGroup into the HashSet. Python For loop is used for iterating over an iterable like a String, Tuple, List, Set, or Dictionary. Output: A Computer Science portal for geeks. It only updates a tail, and therefore, it’s O (1) constant-time complexity. So either is the requirement non-sense or the function signature. Following is the declaration of iterator() method: Oct 10, 2016 · Your collection is containing Integer objects, so while iterating through foreach loop, you should write for (Integer i : collection) - that is because primitive type int do not have its own Iterator implementation. This yields values from a (inclusive) to b (exclusive) in steps of one. Using for loop. This is the simplest approach to detect a loop in a linked list. This class offers constant time performance for the Oct 23, 2023 · To access all the elements in a HashSet, you can use a for-each loop. Apr 15, 2013 · 3. A HashSet is a collection that contains no duplicate elements. by using both Iterator and enhanced for loop. HashSet<T>() Initializes a new instance of the HashSet<T> class that is empty and uses the default equality comparer for the set type. simple for-each loop. Only the List<T> class has a ForEach method. May 28, 2015 at 12:04. loops over all the words returned by getWordArray() and puts Jan 8, 2024 · Iterator. iterator(); Then we can use the obtained iterator to get elements of that Set, one by one. Feb 27, 2023 · A hash set internally uses the hash table data structure to store data items. In the actual scenario, the elements are kidney donors being matches to patients. HashSet<T> also implements IEnumerable<T>, which can be used to enumerate the collection in a much more efficient way. – user2891462. the for loop wouldnt compike becuase you had two verhuur. Jan 10, 2023 · well, if the function you need to implement really has two hashset-params, the requirement of joining two elements based on their index in those sets is non-sense, as there simply is no order in a hashset and thus no index. Using forEach () method. It is meant to query collections of data. LinkedHashSet(Collection C): Used in initializing the HashSet with the elements of the collection C. Hash[] will then take the array (of arrays) and convert it to a hash. Dec 13, 2023 · Java for loop provides a concise way of writing the loop structure. HashSet. イテレータは、ランダムな順序で要素を May 5, 2016 · This is all about not being able to make reference assignments within a for-each loop, and has nothing to do with mutable vs. You can also use forEach statement available from Java 8 to loop through Set. Firstly, we will create an empty hashset. – for loops for and range. println(s); } Or with Java 8: set. Dec 1, 2023 · Using the enhanced for loop with a HashSet like this demonstrates that we can use it with different types of collections. Following are few key points to note about HashSet in Java - HashSet cannot contain duplicate values. HashSet looks like: I h Jan 1, 2012 · I've written the following for loop to display all substrings from a provided word. I'm new to Rust and I'm not aware of a known good way to iterate over a HashSet (or in fact any container) while extending it. I believe using the hash set has a better performance than an array list. Remember : In computing maximum assign -∞ as initial max. If this is a one-time deal, the simplest solution is to make two nested loops on the results of ToList() or ToArray() , like this: Dec 28, 2019 · The example also shows how to get HashSet elements using an index using an iterator, for loop, array, and list. Declare the HashSet using Set Interface. println(stock); } This will print all the stocks von the setOfStocks on the console. Iterate over a set using for_each loop. Loop through the items of an HashSet with a for-each loop: Mar 23, 2022 · This post will discuss how to iterate over a HashSet<T> in C#. Using ArrayList. It should be used if you need both map keys and values in the loop. (Code shown below) I have used a hashSet as it guarantees no duplicates are inserted instead of an ArrayList which would have to use the contain () method and iterate through the list to check if it is already there. Jul 30, 2019 · C# HashSet is an unordered collection that contains unique elements. Here, we have used the for-each loop to iterate each element of the set. Constructor. Output: 2. ToString). The order of the elements returned by the HashSet iterator is not constant over time. This confused me. The for in construct can be used to iterate through an Iterator. HashSets are used to store a collection of unique elements. However when your system is Sep 11, 2023 · It extends the HashSet class and implements the Set interface. Now questions are When should you use for loop and when Iterator is an appropriate option. e. Enumerator object for the HashSet<T> object. It makes no guarantees as to the iteration order of the set; in particular, it does not guarantee that the order will remain constant over time. Nov 28, 2023 · Solution 1: Hashset in Javascript. Feb 6, 2022 · Method-2: Using HashSet. Add elements to the object created. HashSet is an unordered collection. Assume that your set contains 3, 2, 111, then you have three loops where atPos is 3, 2 and finally 111. Btw, Java 8 also introduced a new to loop over a set, that is by using the forEach() method if you are lucky to be running on Java 8 then you can use that as well. It return elements in random order from what present in the HashSet. Add elements into the HashSet using the add () method. Display the HashSet to determine order of elements. Jun 25, 2020 · Iterate over the elements of HashSet in Java; Iterate through elements of Java LinkedHashSet; How to iterate HashSet in Java? Iterate through elements of a LinkedList using a ListIterator in Java; Traverse through a HashSet in Java; Iterate through ArrayList in Java; Golang Program to Iterate through Elements of Dictionary Sep 11, 2014 · 4. Oct 11, 2016 · Iterating Set using enhanced for-loop Shantanu Narayen null Francisco D’Souza Satya Nadella Sundar Pichai Shiv Nadar 2. Iterate over a set in backward direction using reverse_iterator. , for (i=0; I <n; i++). Entry<Integer, Integer> entry : map. HashSet<T> hashset = new HashSet<T>(); //the special situation where we need index way of getting elements. 1) Enhanced For loop Java HashSet iterator() Method. Generic namespace. Method 2: Using iterators. Iterate using for each loop. NET HashSet class provides several methods to add items, remove items, find and search items. MinValue; private int min = int. Iterate using for loop. Jan 28, 2021 · The three different ways we can get elements by index in a HashSet is by: Using an array. The HashSet<T> class represents a hash set that is defined in the System. ForEach has nothing to do with querying. A hashset is a collection of unique elements. We can apply the Iterator concept for any Nov 29, 2014 · Also, HashSet uses the hashCode, so in above case, it should not add the object e5. Hashsets are used to store sets of data, where the order of the elements is not important. Oct 12, 2023 · Java で Set/HashSet を配列に変換して反復処理する. However, the elements of the HashSet can be sorted indirectly by converting into List or TreeSet, but this will keep the elements in the target type instead of HashSet type. MaxValue; // Removes all negative numbers and calculates max and min values. ここでは、 HashMap の要素を繰り返し処理するために for-each ループを使用します。. One of the easiest ways to create an iterator is to use the range notation a. private HashSet<HeroStats> stats = new HashSet<HeroStats>(); public IEnumerator<HeroStats> GetEnumerator() return stats. Method 3: Using an iterator to iterate through a HashMap. For Loops in Python are a special type of loop statement that is used for sequential traversal. As you stated, converting to an array can have some performance drawbacks. Nov 2, 2018 · The current code uses a nested for loop, which checks if the x values of the two elements are equal but the y values are different, but this is quite slow. Nov 11, 2016 · For my assignment I have been asked to produce the following: Creates a HashMap&lt;String,Integer&gt; Loops over all the words returned by getWordArray() and puts each word into the HashMap with the Mar 25, 2012 · I am using a set of graph nodes and the nodes have id and an attribute connected Component number. The following example shows the usage of the foreach for printing the contents of a set. getKey () to get key from the set. In this tutorial, we will learn about hashset java. Approach: Create an object of HashSet. It's also important to note that HashSet does implement IEnumerable<T>. Dec 13, 2016 · Slice sliceToRemove = new Slice(type,size,price); pizza. Key. LINQ doesn't have ForEach. Generic. So each donor can only donate to a single patient. Core aspects: The C# HashSet is a hash-based collection The hash set has a Contains method that allows you to check whether a value is in the set. Algorithm. println(element); } # Output: # Hello # World In this example, we’re using a for-each loop to iterate over the HashSet ‘set’. out. set. The most basic and close-to-metal method of iterating over the set is invoking the iterator method exposed by every Set: Set<String> names = Sets. Moreover, it confirms that the resulting array has length = 3, corresponding to the number of elements in the Nov 1, 2015 · dateformat is used for every one of the loops. for() The code creates a HashSet object and provides strings to it. Note that a HashSet<T> does not provide an indexer. remove(sliceToRemove); it will remove slice from Set if there is a slice with the same type,size and price. Syntax: for (initialization expr; test expr; update exp) {. 8 version Jan 8, 2024 · Here, we create a HashSet named integerSet with three Integer elements: (5, 10, and 15). com/john to try Mailgun today. 2. b. iterator (). The keys in a hashset are the elements of the set, and the values are arbitrary. (presume this refers to one of my WordGroups. Using iterator() method you can get an iterator and then using the hasNext() and next() method of the iterator you can iterate a HashSet. Below programs illustrate the use of above-discussed method: Mar 25, 2015 · Combining this with your actual loop to remove the items from the Hashtable, you should be able to get the equivalent functionality of your example above with the following 3 lines of code: For Each key As String In (From modkey As DictionaryEntry In modHashTable Where modkey. You can instantiate outside for effiency. GetEnumerator(); The disadvantage of HashSet is that range-based for loops and other iteration patterns will access the elements in an unpredictable and seemingly random order. Equals("a")) on its own is O (1). We'll cover the following. 以下の例を参照してください。. In this article, we will see how to loop Hashset in java. HashSet contains only unique elements. Sep 5, 2015 · You need to specify that you want to iterate over the HashSet that is contained in the Problem, not the Problem itself: foreach (Question question in problem. The HashSet Java document has the below-given HashSet: Iteration and Sorting. But it successfully adds that element to the set. Method 1: By using Cursor which is Iterator. We can use the enhanced for loop to iterate through the elements of the HashSet object as given below. In the second method, the forEach function to iterate the key-value pairs. The call hashData. The test method is responsible for verifying the conversion of this Integer HashSet into an array of Integers, referred to as integerArray. I presume one should be verhuurs. Iterate over a set using range-based for loop. Let us understand Java for loop with Examples. Iterating a HashSet – Java example. Create a variable and assign it with the value MAX_VALUE. In Python, the implementation of a hash set is done by using a set itself. Mar 7, 2022 · You can use For-Each loop (Advanced or enhanced for loop), available from Java 5. Conclusion. Loop Through a HashSet. That means a HashSet<T> maintains no particular order and So, if I try to remove elements from a Java HashSet while iterating, I get a ConcurrentModificationException. I came up with the following (generalized from the Earley use case): use std::collections::HashSet; fn extend_from_within<T, F>(original: &mut HashSet<T>, process: F) There are two ways to iterate, loop or traverse over HashSet in Java, first using advanced for-each loop added on Java 5 and second using Iterator which is a more conventional way of iterating over HashSet in Java. HashSet stores the elements by using a mechanism called hashing. 1. You can perform insert, update, delete and other operations on the hash set using Python. Please note we should not modify the set after the iterator is created (except through the iterator Oct 16, 2021 · From the code given below: set. Equals("a")) is O (N) but be aware that it will only be executed if you actually use foreach or some other looping construct to loop over the elements of the returned sequence. Jun 3, 2019 · I am trying to print duplicate elements in one d array using for each loop. Directly printing it using a reference variable. HashSet () O (1) Initializes a new HashSet of the specified element type. Import the required Java package java. WriteLine(number); public sealed class ItemProcessor. The HashSet<T> is a generic class in the System. use std::collections::HashSet; #[derive(Hash, Eq, PartialEq, Debug)] struct Viking {. Feb 23, 2022 · Now I need to iterate or loop through so that each value in the 'boxing' HashSet creates a new HashMap with the value as the key for the new map. The standard solution to iterate over the HashSet<T> object is using a foreach loop. The HashSet operations to add/access/remove an element run in O (1) time. get () – searching for an element takes O (n) time. . Below is the implementation of the above approach: Program 1: By Converting HashSet to List. Method 1: Using Array. You have to implement IEnumerable in your Team class. Hash is binary tree so performance is Log2 (N). It not maintains any order for its elements. This class implements the Set interface, backed by a hash table (actually a HashMap instance). HashSet allows null value. i will be zero based, so you need to use i+1 Jan 9, 2023 · Using Java 8 Stream API: HashSet constructor can take another collection object to construct a new set containing the elements of the specified array. b) In the main method: use the getWordSet() method using the two WordGroup s. How to get elements by index from HashSet in Java? The HashSet is a collection of unique elements. Jun 22, 2016 · returns the HashSet<String>. Let’s start discussing each of these methods in detail. Syntax: public System. Using a for loop. Jul 1, 2009 · Method #1: Iterating over entries using a For-Each loop. for문을 사용하여 Set의 모든 아이템에 접근할 수도 있습니다. What is the best way to remove a subset of the elements Mar 8, 2024 · Step 2: Create a HashSet using the HashSet class as shown below: Step 3: If you want to add elements in your HashSet, then use Add () method to add elements in your HashSet. Iterating a HashSet. Java で Array クラスの stream() メソッドを使って Set/HashSet を反復処理する. Source and many others easily found in the internet. Convert the Stream to Set using Collectors. これもまた、 HasMap を繰り返し処理するための解決策です。. In Python, there is no C style for loop, i. iterator () and Java 8 forEachRemaining () method. Get the Array to be converted. Map<Integer, Integer> map = new HashMap<Integer, Integer>(); for (Map. Apr 2, 2013 · Console. Since this is just an example the method does nothing else than printing the value again. newHashSet( "Tom", "Jane", "Karen" ); Iterator<String> namesIterator = names. Syntax. May 6, 2023 · The basics: A HashSet is a collection that holds unique elements in no particular order ( O (1) complexity for adding, searching or removing). Just like a set, a hash set also does not allow storage of duplicate elements. This is the most common method and is preferable in most cases. As I iterate over the graph nodes and found a certain node in the adjacency list of the iterated node, I need to update the connected component num. Class HashSet<E>. Oct 31, 2019 · I am trying to loop through a HashSet of Enum Objects in Java 8 to see if a value is equal to a specific string. Max(item, max); Jan 8, 2024 · Let’s present the average estimate of time we need to perform some basic operations: add () – appends an element to the end of the list. Dec 28, 2020 · Method 1: Using for-loop to print maximum element in a HashSet. Using an iterator. Oct 12, 2023 · Java の foreach を用いた HashMap の繰り返し処理. In this video, we will discuss different ways to iterate over a HashSet:- Enhanced for loop- Basic loop with an iterator- While loop with an iterator- JDK 8 Jan 7, 2021 · Different Ways to Iterate LinkedHashSet Elements: Method 1: Using the for-each loop. This specific loop prints it to the standard output stream and then passes the object to the processObject(Object o) method. util. Apr 18, 2017 · This is where I initialize my HashSet. Anyway you have to have attributes which identify a slice in the Set. import java. As a result, the code becomes cleaner and more focused on business logic rather than loop control mechanics. Using Iterator. However, one of the requriements is for the word to one display unique substrings only. Let's write FizzBuzz using for instead of while. Its very much common requirement to iterate or loop through Hashset in java applications. forEach(System. Thereafter, we will traverse the nodes in the list one by one and store these node addresses in a hash table. If 'mom' was giving to the following code it'd display the substrings of length one as 'm', 'o' and 'm', giving a duplicate of 'm'. LinkedHashSet<E> hs = new LinkedHashSet<E>(); 2. Constructors of LinkedHashSet Class. In addition, the HashSet<T> implements the ISet<T> interface and therefore provides many methods for working with sets, such as union, intersection and determining if a set of values is a (proper) super- or subset of your set. Jul 31, 2012 · In this HashSet case, intuition would also suggest that clear() (which basically sets the HashSet#table array of "pigeon holes" to null) would be faster than building a brand new collection (which in any case requires that same table to be initialized/resseted to zeros). Apr 9, 2024 · where Self: Sized , F: FnMut (& [Self:: Item; N ]) -> R, 🔬 This is a nightly-only experimental API. Feb 1, 2019 · HashSet<T>. This class permits the null element. Method 2: Using a forEach to iterate through a HashMap. iterator보다 for가 좀 더 간단해보입니다. ) I have seen other examples of for loops being used to to store objects, but I have never done this personally. Could anyone please assist? Nov 16, 2018 · I searched and got to know some ways to iterate over a HashSet, like using: Java 8 forEach and lambda expression. We can use the remove() method provided by the Iterator interface that removes the latest element returned by the iterator. Collections. Iterate through the elements of LinkedHashSet using the iterator method. But in this particular case things happen the other way round. Generic namespace, ideal for managing large data sets and performing set operations. ToString. . So you use features of HashSet and then you take advantage of indexes. Enumerator GetEnumerator (); Return Value: It returns a HashSet<T>. Sorting a HashSet. Feb 13, 2017 · You can use an enhanced for loop: Set<String> set = new HashSet<String>(); //populate set for (String s : set) { System. It is implemented as a hash table, which means that the elements are stored in an array of buckets, and each bucket is associated with a hash code. Like slice::windows() , the windows during mapping overlap as well. It inherits the AbstractSet class and implements the Set interface. private HashSet <Integer> mySet = new HashSet<Integer>(); uhm, your atPos is the integer from the set that you have gathered. a) Create a method in the WordGroup called getWordCounts() which: creates a HashMap<String, Integer>. If you want to maintain a particular order for the questions, you should use a List. Using LinkedHashSet. ToList Jul 13, 2018 · HashMap (HashSet uses HashMap<E,Object>) isn't designed for iterating all items. Without overriding equals you have to iterate through the Set, check those attributes and then remove if they match. Again, the enhanced for loop simplifies the process of iterating over a set where elements are unordered and unique. Iterate using an Iterator. entrySet()) {. non-mutable keys. この記事では、イテレータを使わずに Java で Set や HashSet を反復処理する方法を紹介します。. Here’s an example: for (String element : set) { System. Then, it makes use of a for loop to iterate via the HashSet object and print each element. 1) Enhanced For loop 2) Iterator. Iterating HashSet using enhanced for-each loop introduced in Java 1. Foreach and Stream API are convenient to work with Collections, you can write code faster. GetEnumerator(); IEnumerator IEnumerable. 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