hashmap Archives - Page 3 of 5

Key existence check in HashMap

Is checking for key existence in HashMap always necessary? I have a HashMap with say a 1000 entries and I am looking at ...

May 12, 2022
0 Comments

How to convert a ruby hash object to JSON?

How to convert a ruby hash object to JSON? So I am trying this example below & it doesn’t work? I was looking ...

May 10, 2022
0 Comments

C# Java HashMap equivalent

Coming from a Java world into a C# one is there a HashMap equivalent? If not what would you recommend? 7 Answers 7

May 9, 2022
0 Comments

What is the difference between the HashMap and Map objects in Java?

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 ...

May 8, 2022
0 Comments

JavaScript hashmap equivalent

As made clear in update 3 on this answer, this notation: var hash = {}; hash...

May 8, 2022
0 Comments

How to sort Map values by key in Java?

I have a Map that has strings for both keys and values. Data is like following: “question1”, “1” “question9”, “1” “question2”, “4” “question5”, ...

May 7, 2022
0 Comments

Convert object array to hash map, indexed by an attribute value of the Object

Use Case The use case is to convert an array of objects into a hash map based on string or function provided to ...

May 4, 2022
0 Comments

Java Hashmap: How to get key from value?

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 ...

May 3, 2022
0 Comments

How to remove a key from Hash and get the remaining hash in Ruby/Rails?

To add a new pair to Hash I do: {:a => 1, :b => 2}.merge!({:c => 3}) #=> {:a => 1, :b => ...

April 29, 2022
0 Comments

Why there is no ConcurrentHashSet against ConcurrentHashMap

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 ...

April 28, 2022
0 Comments