So if I have two sets: Set<Integer> test1 = new HashSet<Integer>(); test1.add(1); test1.add(2); test1.add(3); Set<Integer> test2 = new HashSet<Integer>(); test2.add(1); test2.add(2); test2.add(3); test2.add(4); test2.add(5); Is there a way to compare them and only have a set of 4 and 5 returned? 10 Answers 10
New ES 6 (Harmony) introduces new Set object. Identity algorithm used by Set is similar to === operator and so not much suitable for comparing objects: var set = new Set(); set.add({a:1}); set.add({a:1}); console.log([…set.values()]); // Array [ Object, Object ] How to customize equality for Set objects in order to do deep object comparison? Is … Read more
An NSSet can be converted to Array using set.allObjects() but there is no such method in the new Set (introduced with Swift 1.2). It can still be done by converting Swift Set to NSSet and use the allObjects() method but that is not optimal. 6 Answers 6
MSDN references JavaScript’s Set collection abstraction. I’ve got an array of objects that I’d like to convert to a set so that I am able to remove (.delete()) various elements by name: var array = [ {name: “malcom”, dogType: “four-legged”}, {name: “peabody”, dogType: “three-legged”}, {name: “pablo”, dogType: “two-legged”} ]; How do I convert this array … Read more
In Python, which data structure is more efficient/speedy? Assuming that order is not important to me and I would be checking for duplicates anyway, is a Python set slower than a Python list? 10 Answers 10
I have a list of filenames in python and I would want to construct a set out of all the filenames. filelist=[] for filename in filelist: set(filename) This does not seem to work. How can do this? 8 Answers 8
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago. Improve this question I’m trying to solve “The go programming lanaguage” exercise #1.4 which requires me to have a … Read more
I’m sure there’s a good reason, but could someone please explain why the java.util.Set interface lacks get(int Index), or any similar get() method? It seems that sets are great for putting things into, but I can’t find an elegant way of retrieving a single item from it. If I know I want the first item, … Read more
How can I make as “perfect” a subclass of dict as possible? The end goal is to have a simple dict in which the keys are lowercase. It would seem that there should be some tiny set of primitives I can override to make this work, but according to all my research and attempts it … Read more
This question already has answers here: Efficiently finding the intersection of a variable number of sets of strings (8 answers) Closed 1 year ago. Possible Duplicate: Efficiently finding the intersection of a variable number of sets of strings Say, have two Hashset, how to calculate the intersection of them? Set<String> s1 = new HashSet<String>(); Set<String> … Read more
