A hash table is a data structure used to implement an associative array (a structure that can map keys to values). It uses a "hash function" to compute an index into an array from which the value can be found.
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NestedHash Class
I want to make a Ruby nested hash table class to avoid repeating ugly code and to keep my programs as true to the OOP paradigm as I can. Are there any ways to make this class definition smaller ...
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1answer
48 views
Creating a dictionary
I have a Ruby programming task. My code passes all the rspec requirements, but I am not sure if I've done it in the right way. And I'm not quite sure why I need ...
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1answer
42 views
4
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3answers
100 views
Python Hash Table Implementation
I'm attempting to implement a basic hash table in Python using only lists. any tips would be appreciated (including better hash functions).
I intend this to handle collisions with separate chaining.
...
2
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1answer
174 views
Convert Multivalued map to HashMap
I have a Multivalued map (javax.ws.rs.core.MultivaluedMap<String, String>) which I want to convert to regular HashMap so I got below code:
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2
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1answer
83 views
Hackerrank challenge - Dictionaries and Maps in Erlang
This question is really similar to an existing one in Ruby. So the task is also the same: Day 8: Dictionaries and Maps!
The problem is that on Hackerrank my solution only passes the first and last ...
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1answer
216 views
Mapping phone numbers to names [closed]
Problem description:
You are given a phone book that consists of your friend's names and
their phone number. After that you will be given your friend's name
as query. For each query, print the ...
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2answers
265 views
Hackerrank challenge - Dictionaries and Maps
This is a solution for the Day 8 hackerrank.com challenge. The basic idea of the challenge is to create a mapping of names to phone numbers based on the the given input, and later look up the phone ...
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2answers
47 views
Adding polynomials represented as maps
I'm using maps to represent a polynomial.
The key is the exponent and the value is the coefficient : Map(exp -> coef)
e.g. ...
5
votes
2answers
41 views
Refactoring if statement based on a hash key
I have to call Article.to_draft/to_archive/publish method depending on the presence of the ...
4
votes
2answers
62 views
Dictionary implementation using hash table in C
I have written the below code which loads the dictionary and checks if the given word is present or not.
The implementation is using a hash table with a chained linked list.
In regards to the hash ...
3
votes
2answers
144 views
HashMap or associative arrays in C
I am trying to implement an HashMap in C. I am trying to used a linked list style of interfacing to make adding and removing keys easy and efficient. Searching is ...
4
votes
0answers
19 views
Variation of the internal PHP hashtable
I'm working on a PHP extension in an attempt to learn some C. I've implemented a variation of the internal PHP hashtable, which uses a lookup table and a separate bucket table. The lookup table simply ...
6
votes
2answers
64 views
Unicode-capable symbol table (N-way search tree with hash buckets)
As in my previous question, this module is coupled with its own testing framework.
As a symbol-table for a Unicode-capable programming language interpreter, I decided to combine the 3 types of ...
6
votes
4answers
194 views
Hash table and linked list implementation in C++
I'm trying to improve my understanding of inheritance and template classes in C++ so I coded a hash table (see compilable source code below).
I would be greatly appreciative of any comments on how to ...
6
votes
1answer
54 views
Remove a key from a hash table efficiently
I am trying to remove a key from a hash table, which is built using linear probing. Removing a key works fine but I know I need to rehash a portion of the table after the removal but my method down ...
7
votes
2answers
278 views
Trie key/value store implementation comparing with HashMap
I have implemented a Trie-based concurrent key/value store using hashcode similar to HashMap.
It is something like, if your ...
2
votes
0answers
79 views
Jacob's Ladder compression [closed]
I'm currently interested in a logical decay algorithm which will need me to have the correct coordination of 3 bytes. I have 2 of them, initially. After that, I have to get 2 from the one, but in that ...
3
votes
1answer
188 views
Hash function for strings
Implementation of a hash function in java, haven't got round to dealing with collisions yet.
I tried to use good code, refactored, descriptive variable names, nice syntax.
My code must be efficient ...
1
vote
1answer
92 views
Hash Map Library for any type (Void Pointers)
This is a hash map library for C that stores void* pointers with char* strings (null terminated) for keys
...
10
votes
1answer
85 views
ConcurrentDecayingHashMap<K,V>, a concurrent decaying HashMap
I wrote a wrapper for Java's ConcurrentHashMap that enables you to add a decay time to inserted values, meaning they will be automatically removed after the given ...
3
votes
2answers
237 views
Using EqualityComparer to find contained value
While searching for a method in HashSet which allows me to actually find an object in \$O(1)\$ (not just Contains, I need the ...
4
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1answer
32 views
Optimizing “complex” iteration over Map with auxiliary maps
This will be tough to explain. I am implementing a tool to support RFC6020. But when it comes to the Choice Statement, things get weird.
For the sake of better understanding, I have to remember you a ...
3
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0answers
83 views
HashMap and HashSet classes for ES6
The new EcmaScript standard, ES6, contains specifications for Map and Set built-in classes. Each of these collections treats an ...
3
votes
1answer
37 views
Creating simulated items sold at a store into a hash
I am writing code that creates a hash for a store that has an item, price, and sku. The hash is inserted into an array. I also create another hash based on the sku that holds the amount of inventory ...
1
vote
1answer
62 views
Gathering metadata on files in GitHub
I am a relatively new programmer and am currently working on something with the egit GitHub client library which requires me to iterate over a bunch of values and if a condition is met, add a bunch of ...
3
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1answer
94 views
Constructing NewsArticle objects from a database table
This class seems to be able to represent the data stored in any possible database table:
...
10
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3answers
953 views
HashTable implementation in C++
I made a simple hash table and I was wondering if there was any way to increase the efficiency of search times. My table class is called Dictionary, because C# has ...
2
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1answer
47 views
My own implementation of an hashtable
This is my own implementation of an hashtable. I would like to receive some reviews or some feedbacks.
...
2
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1answer
91 views
(Y.E.S.E.J.) Yet Another Singleton with Enum in Java
I have a Java class which has to be generated only once for all the objects that I have - it is a small program. This singleton class holds a mapping of characters. I Googled stack overflow and found ...
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3answers
245 views
Initialize a hash with all 0 values based on two arrays
Given two arrays (for instance a list of people and a list of subjects), I need to initialise a Hash with all zeros for all possible combinations of these two ...
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3answers
342 views
11
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1answer
236 views
OOP paradigm implementation of a Dictionary data model
Here is the implementation of interface Dictionary using chained hash table class HashTableChained.
Despite item 22* saying
...
4
votes
1answer
55 views
Unordered (hash) map for C
I am still working on basic data structures for C. Now I came up with a hash map:
unordered_map.h:
...
3
votes
1answer
55 views
Ordered map for C using AVL tree
I was in the mood for some data structures and I decided to code up an ordered map using AVL tree. I will post only map.h and ...
3
votes
1answer
172 views
Duplicate integers in an array
Code shows duplicate values of integers in an array with indexes and the number of occurrences. Can you please critique my code and provide your thoughts on where I should improve my code?
...
1
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1answer
28 views
Capping values in a map while keeping one fixed
I'm working with some Clojurescript code that reacts to user input over three sliders. These sliders get stored in a map, and I need to make sure that the sum of all is <= a ...
5
votes
2answers
166 views
Find the rarest in a map
Write a method rarest that accepts a map whose keys are strings and
whose values are integers as a parameter and returns the integer value
that occurs the fewest times in the map. If there is a ...
5
votes
4answers
930 views
Finding the most common character in a string with a hash map
I created a method for finding the most common character in a string (using HashMap):
...
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0answers
90 views
5
votes
2answers
229 views
Function that shortens a String based on a term/abbreviation mapping
I have a function that takes a description as a String and returns a shortened version of the description.
The shortening is done by checking if a word matches the ...
4
votes
3answers
985 views
Most common occurrence of an int in an array
I am prepping for a junior level interview in C#. I am hoping I can get some feedback on how to improve my code to print the most common occurrence of an int in an ...
2
votes
1answer
76 views
Chained hash table implementation to store student's information
This is my implementation of a Hash Table to store information about a student. Everything seems to work as expected, but I'd like some feedback on the following:
Is my style good? Is it easy to ...
6
votes
2answers
393 views
Hash table based key/value dictionary in C++ with murmur hash function, linked list buckets in 200 LOC
hashdic.h -- suggested for direct include or copy paste to your project.
...
5
votes
1answer
43 views
Dump hash in columns
I tried to answer the question "How to print a hash in Perl, such that 3 key value pairs are printed on each line?" like this.
As I got an uncommented downvote, I'd like to ask: What's wrong with/How ...
4
votes
1answer
131 views
ConcurrentHashMap Implementation
I have written a simplified version of my own MyConcurrentHashMap. I tried to make use of a Lock[] array for ...
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vote
3answers
115 views
Faster method for loading a hash table
I'm looking to make my code faster for loading a hash table. Any pointers would be appreciated. Below are my includes, the node def and the loading code.
The dictionary loaded could be any *.txt ...
4
votes
1answer
80 views
Concatenating a SoundCloud Playlist Update JSON
I am currently working on an implementation of SoundCloud for a 3rd party iOS app, and as there is no SDK anymore I am doing all my calls via Alamofire.
This is what SC expects you to send in your ...
2
votes
1answer
297 views
LRU cache design using dict and doubly linked list
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set.
get(key) - Get the value (will always be positive) of the ...
3
votes
1answer
179 views
A minimal HashTable implementation
For an assignment, I wrote a minimal HashTable implementation (it only supports additions; no deletions).
To resolve collisions, it uses Linear Probing (required by the assignment).
I'm looking for ...
