hashmap | This package implements a hashmap in Elm | JSON Processing library

 by   elm-explorations Elm Version: Current License: Non-SPDX

kandi X-RAY | hashmap Summary

kandi X-RAY | hashmap Summary

hashmap is a Elm library typically used in Utilities, JSON Processing applications. hashmap has no bugs, it has no vulnerabilities and it has low support. However hashmap has a Non-SPDX License. You can download it from GitHub.

This package implements a hashmap in Elm. Rather than comparing keys like in Dict, keys are hashed to an Int first.
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            kandi-support Support

              hashmap has a low active ecosystem.
              It has 12 star(s) with 0 fork(s). There are 6 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              hashmap has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of hashmap is current.

            kandi-Quality Quality

              hashmap has 0 bugs and 0 code smells.

            kandi-Security Security

              hashmap has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              hashmap code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              hashmap has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              hashmap releases are not available. You will need to build from source code and install.

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            hashmap Key Features

            No Key Features are available at this moment for hashmap.

            hashmap Examples and Code Snippets

            No Code Snippets are available at this moment for hashmap.

            Community Discussions

            QUESTION

            Find occurrence count of the longest common Prefix/Suffix in a List of Strings?
            Asked 2022-Mar-22 at 07:13

            Given a list of Strings:

            ...

            ANSWER

            Answered 2022-Mar-22 at 07:13

            This problem should be solved easily using a trie.

            The trie node should basically keep a track of 2 things:

            1. Child nodes
            2. Count of prefixes ending at current node

            Insert all strings in the trie, which will be done in O(string length * number of strings). After that, simply traversing the trie, you can hash the prefixes based on the count as per your use case. For suffixes, you can use the same approach, just start traversing the strings in reverse order.

            Edit:
            On second thought, trie might be the most efficient way, but a simple hashmap implementation should also work here. Here's an example to generate all prefixes with count > 1.

            Source https://stackoverflow.com/questions/71463016

            QUESTION

            Stream API allMatch() with mulitple nullable nested objects
            Asked 2022-Jan-06 at 12:36

            I'm working on a request validation feature where I need to check if a certain string value is present in a property that is contained in an object, which is contained as a value of a map entry, that map is a part of an object and finally my request body contains a set of those objects.

            To try and make it clearer I will recreate my situation using only parts of code that are important.

            Lets say my ClassA is received in request body, it has following properties:

            ...

            ANSWER

            Answered 2022-Jan-05 at 14:22

            I'd try making use of Stream.filter(). Something like Stream.filter(x -> x!=null) should work instead of (and be more elegant than) if statements.

            In your case it would be necessary before every one of your object or field (that is nullable) getters I'm afraid. But that's the most streamish' way I'd go for.

            You can also use it in conjuction with the isEmpty() method for cases of empty maps.

            An alternative would be to add if statements within your getter functions. That would allow you to keep the exact stream you wrote already.

            Source https://stackoverflow.com/questions/70594175

            QUESTION

            Setting values in thymeleaf using a map
            Asked 2021-Dec-28 at 12:45

            I Generates a checkbox list from the map. Now how to set the value for the key (false / true) and now I can download it in UserConfig so that I can use this value in the rest of the project.

            My view:

            ...

            ANSWER

            Answered 2021-Dec-28 at 12:45

            With Preprocessing (if I got you right), we could try something like:

            Source https://stackoverflow.com/questions/70506505

            QUESTION

            Lifetime issue with From<&V> trait constraint
            Asked 2021-Dec-23 at 08:04

            The following code produces the lifetime errors below despite the fact that the V instance in question is owned.

            ...

            ANSWER

            Answered 2021-Dec-23 at 08:01

            QUESTION

            Java Map.getOrDefault with bounded wildcard
            Asked 2021-Dec-15 at 11:48

            Got a Map> mapOfMaps variable.

            ...

            ANSWER

            Answered 2021-Dec-15 at 10:16

            One possible, but still rather clunky, solution is a helper function:

            Source https://stackoverflow.com/questions/70359061

            QUESTION

            Minimum moves to transform a list so that each element equals its own frequency
            Asked 2021-Oct-03 at 10:59

            Given a sorted array like [1,2,4,4,4]. Each element in the array should occur exactly same number of times as element. For Example 1 should occur 1 time, 2 should occur 2 times, n should occur n times, After minimum number of moves, the array will be rendered as [1,4,4,4,4]

            ...

            ANSWER

            Answered 2021-Sep-24 at 19:58

            The error is in this comparison:

            Source https://stackoverflow.com/questions/69315660

            QUESTION

            Spring Security with JWT for REST API
            Asked 2021-Sep-18 at 07:25

            I have this class:

            ...

            ANSWER

            Answered 2021-Sep-18 at 07:25

            Double check your jwt token. I think it miss sub attribute( subject or username here).

            I also highly recommend you write the few unit test for few class such as JwtTokenUtil to make sure your code working as expected. You can use spring-test to do it easily.

            It help you discover the bug easier and sooner.

            Here is few test which i used to test the commands "jwt generate" and "jwt parse"

            Source https://stackoverflow.com/questions/69134968

            QUESTION

            What is the complexity of HashMap#replace?
            Asked 2021-Aug-25 at 11:19

            I was wondering what was the complexity of the replace(Key , Value) for a HashMap is.

            My initial thoughts are O(1) since it's O(1) to get the value and I can simply replace the value assigned to the key.

            I'm unsure as to if I should take into account collisions that there might be in a large hashmap implemented in java with java.util.

            ...

            ANSWER

            Answered 2021-Aug-25 at 10:30
            tl:dr

            HashMap#replace runs in O(1) amortized;

            and under the premise that the map is properly balanced, which Java takes care of during your put and remove calls, also non-amortized.

            Non-amortized

            The fact whether it also holds for non-amortized analysis hinges on the question regarding the implemented self-balancing mechanism.

            Basically, due to replace only changing the value which does not influence hashing and the general structure of the HashMap, replacing a value will not trigger any re-hashing or re-organization of the internal structure.

            Hence we only pay for the cost of locating the key, which depends on the bucket size.

            The bucket size, if the map is properly self-balanced, can be considered a constant. Leading to O(1) for replace also non-amortized.

            However, the implementation triggers self-balancing and re-hashing based on heuristic factors only. A deep analysis of that is a bit more complex.

            So the reality is probably somewhere in between due to the heuristics.

            Implementation

            To be sure, let us take a look at the current implementation (Java 16):

            Source https://stackoverflow.com/questions/68920278

            QUESTION

            Serialization in Haskell
            Asked 2021-Jul-01 at 18:53

            From the bird's view, my question is: Is there a universal mechanism for as-is data serialization in Haskell?

            Introduction

            The origin of the problem does not root in Haskell indeed. Once, I tried to serialize a python dictionary where a hash function of objects was quite heavy. I found that in python, the default dictionary serialization does not save the internal structure of the dictionary but just dumps a list of key-value pairs. As a result, the de-serialization process is time-consuming, and there is no way to struggle with it. I was certain that there is a way in Haskell because, at my glance, there should be no problem transferring a pure Haskell type to a byte-stream automatically using BFS or DFS. Surprisingly, but it does not. This problem was discussed here (citation below)

            Currently, there is no way to make HashMap serializable without modifying the HashMap library itself. It is not possible to make Data.HashMap an instance of Generic (for use with cereal) using stand-alone deriving as described by @mergeconflict's answer, because Data.HashMap does not export all its constructors (this is a requirement for GHC). So, the only solution left to serialize the HashMap seems to be to use the toList/fromList interface.

            Current Problem

            I have quite the same problem with Data.Trie bytestring-trie package. Building a trie for my data is heavily time-consuming and I need a mechanism to serialize and de-serialize this tire. However, it looks like the previous case, I see no way how to make Data.Trie an instance of Generic (or, am I wrong)?

            So the questions are:

            1. Is there some kind of a universal mechanism to project a pure Haskell type to a byte string? If no, is it a fundamental restriction or just a lack of implementations?

            2. If no, what is the most painless way to modify the bytestring-trie package to make it the instance of Generic and serialize with Data.Store

            ...

            ANSWER

            Answered 2021-Jul-01 at 18:53
            1. There is a way using compact regions, but there is a big restriction:

            Our binary representation contains direct pointers to the info tables of objects in the region. This means that the info tables of the receiving process must be laid out in exactly the same way as from the original process; in practice, this means using static linking, using the exact same binary and turning off ASLR. This API does NOT do any safety checking and will probably segfault if you get it wrong. DO NOT run this on untrusted input.

            This also gives insight into universal serialization is not possible currently. Data structures contain very specific pointers which can differ if you're using different binaries. Reading in the raw bytes into another binary will result in invalid pointers.

            There is some discussion in this GitHub issue about weakening this requirement.

            1. I think the proper way is to open an issue or pull request upstream to export the data constructors in the internal module. That is what happened with HashMap which is now fully accessible in its internal module.

            Update: it seems there is already a similar open issue about this.

            Source https://stackoverflow.com/questions/68215186

            QUESTION

            Java: HashMap.getOrDefault returns null value
            Asked 2021-Mar-26 at 09:45

            I'm fairly new to Java coming from a Python and C# background. I don't know why I am getting a null value for HashMap.getOrDefault() when from my understanding, this method is built in the first place to avoid NullPointer exceptions. The people object is not null, neither is idKey.

            ...

            ANSWER

            Answered 2021-Mar-26 at 08:51

            The getOrDefault() will return the default value when the key is not found, as per the documentation. If the key is found but the value is null, then null will be returned.

            So, it seems that your map actually contains the key but the corresponding value is null.

            Source https://stackoverflow.com/questions/66813639

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install hashmap

            You can download it from GitHub.
            Elm packages are available at elm-lang.org. If you are going to make HTTP requests, you may need elm/http and elm/json. You can get them set up in your project with the following commands: elm install elm/http and elm install elm/json. It adds these dependencies into your elm.json file, making these packages available in your project. Please refer guide.elm-lang.org for more information.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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