Is checking for key existence in HashMap always necessary? I have a HashMap with say a 1000 entries and I am looking at improving the efficiency. If the HashMap...
How to convert a ruby hash object to JSON? So I am trying this example below & it doesn’t work? I was looking at the RubyDoc and obviously Hash...
Coming from a Java world into a C# one is there a HashMap equivalent? If not what would you recommend? 7 Answers 7
What is the difference between the following maps I create (in another question, people answered using them seemingly interchangeably and I’m wondering if/how they are different): HashMap<String, Object> map...
As made clear in update 3 on this answer, this notation: var hash = {}; hash[X] does not actually hash the object X; it actually just converts X to...
I have a Map that has strings for both keys and values. Data is like following: “question1”, “1” “question9”, “1” “question2”, “4” “question5”, “2” I want to sort the...
Use Case The use case is to convert an array of objects into a hash map based on string or function provided to evaluate and use as the key...
If I have the value "foo", and a HashMap<String> ftw for which ftw.containsValue("foo") returns true, how can I get the corresponding key? Do I have to loop through the...
To add a new pair to Hash I do: {:a => 1, :b => 2}.merge!({:c => 3}) #=> {:a => 1, :b => 2, :c => 3} Is there...
HashSet is based on HashMap. If we look at HashSet<E> implementation, everything is been managed under HashMap<E,Object>. <E> is used as a key of HashMap. And we know that...