Simplest way to merge ES6 Maps/Sets?
Is there a simple way to merge ES6 Maps together (like Object.assign)? And while we’re at it, what about ES6 Sets (like Array.concat)? 16 Answers 16
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How to Iterate over a Set/HashSet without an Iterator?
How can I iterate over a Set/HashSet without the following? Iterator iter = set.iterator(); while (iter.hasNext()) { System.out.println(iter.next()); } 8 Answers 8
In Python, when to use a Dictionary, List or Set?
When should I use a dictionary, list or set? Are there scenarios that are more suited for each data type? 13 Answers 13
Add list to set?
Tested on Python 2.6 interpreter: >>> a=set(‘abcde’) >>> a set([‘a’, ‘c’, ‘b’, ‘e’, ‘d’]) >>> l=[‘f’,’g’] >>> l [‘f’, ‘g’] >>> a.add(l) Traceback (most recent call last): File “<pyshell#35>”, line 1, in <module> a.add(l) TypeError: list objects are unhashable I think that I can’t add the list to the set because there’s no way Python … Read more
Best way to find the intersection of multiple sets?
I have a list of sets: setlist = [s1,s2,s3…] I want s1 ∩ s2 ∩ s3 … I can write a function to do it by performing a series of pairwise s1.intersection(s2), etc. Is there a recommended, better, or built-in way? 7 Answers 7
How to get the first element of the List or Set? [duplicate]
This question already has answers here: Java: Get first item from a collection (14 answers) Closed 3 years ago. I’d like to know if I can get the first element of a list or set. Which method to use? 9 Answers 9
Getting an element from a Set
Why doesn’t Set provide an operation to get an element that equals another element? Set<Foo> set = …; … Foo foo = new Foo(1, 2, 3); Foo bar = set.get(foo); // get the Foo element from the Set that equals foo I can ask whether the Set contains an element equal to bar, so why … Read more
How to check that an element is in a std::set?
How do you check that an element is in a set? Is there a simpler equivalent of the following code: myset.find(x) != myset.end() 11 Answers 11
What is the difference between Set and List?
What is the fundamental difference between the Set<E> and List<E> interfaces? 26 s 26 List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered (thank you, Quinn Taylor). List<E>: An ordered collection (also known as a sequence). The user of this interface has precise control over where … Read more
Append values to a set in Python
I have a set like this: keep = set(generic_drugs_mapping[drug] for drug in drug_input) How do I add values [0,1,2,3,4,5,6,7,8,9,10] into this set? 8 s 8 Define a set a = set() Use add to append single values a.add(1) a.add(2) Use update to add elements from tuples, sets, lists or frozen-sets a.update([3, 4]) >>> print(a) {1, … Read more
