Tags down


Get the first value (string) in a map from the second value (int)

By : Md Shakir
Date : October 16 2020, 06:10 AM
To fix this issue You can sequentially loop through all the entries in the map until you find the one with the value:
code :
for (auto &it : exampleMap)
    if (it.second == value)
        return it.first;

Share : facebook icon twitter icon

Efficient conversion of Scala Map[String,Seq[String]] to java.util.Map<String,List<String>>

By : jatinder singh
Date : March 29 2020, 07:55 AM
To fix this issue I am new to Scala, trying to integrate some existing Java code with Scala-specific functionality in the Play Framework. , Try this:
code :
import collection.JavaConverters._
val javaMap = scalaMap.mapValues(_.asJava).asJava

C# how to encode a long string in to fixed size string and again get back original string from encoded string?

By : jóna kristjáns
Date : March 29 2020, 07:55 AM
Does that help That cannot work? When your reduce the length, information is lost.
The only thing possible is that you decide not to use the full spectrum of UTF-8. Lets assume you only you 7bit ASCII, This means the first 128 chars from the ASCII table. But that only make a length of 7 from a string of length 8. Maybe a bit more if you take into account the full power of UTF-8.

How to merge Stream<Map<String, Map<String, String>>> into a single Map<String, Map<String, Stri

By : MobileCoderZmanx
Date : March 29 2020, 07:55 AM
it fixes the issue I am trying to merge a Stream>> object into a single map with keys in all the Streams. , When you have
code :
Stream<Map<String, Map<String, String>>> stream = ...
.flatMap(map -> map.entrySet().stream())
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (vOld, vNew) -> ...));
//                                                                                ^^^
Map<String, Map<String, String>> combinedMap = 
        /*your Stream<Map<String, Map<String, String>>>*/
        .flatMap(map -> map.entrySet().stream())
        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

How can I create Hashmap<String,Int : String,String : String,String> in Kotlin for sorting

By : user3440474
Date : March 29 2020, 07:55 AM
this one helps. I assume that chatMessages is of type List. This is generally bad because you cannot to anything with strings. I would suggest you to create a data class which contains all information about a chat message, like so:
code :
data class ChatMessage(val dateTime: Int, val userMail: String?, val userMessage: String?) : Comparable<ChatMessage> {
    override fun compareTo(other: ChatMessage) = this.dateTime.compareTo(other.dateTime)
private val chatMessages = mutableListOf<ChatMessage>()
data class ChatMessage(val dateTime:Int?, val userMail: String?, val userMessage: String?) : Comparable<ChatMessage> {
    override fun compareTo(other: ChatMessage) = this.dateTime.compareTo(other.dateTime)

private val chatMessages = mutableListOf<ChatMessage>()

fun yourCode() {
    newReference.addValueEventListener(object : ValueEventListener {

        /* Use proper variable naming. Nobody will understand, what p0 is, but if you name
        it dataSnapshot, everyone knows at a glance. */
        override fun onDataChange(dataSnapshot: DataSnapshot) {


            // Again, what is ds exactly? Name it properly.
            for (ds in dataSnapshot.child(playerIDmatchWhoIs).children) {
                // Kotlin recommends to use val instead of var.
                // This way, you know that your variables cannot be modified unless you want them to be modified.
                val hashMap = ds.getValue() as HashMap<String, String>

                // use indexing instead of the get() method
                val dateTime = hashMap["datetime"]
                val userMail = hashMap["usermail"]
                val userMessage = hashMap["usermessage"]

                // TODO: Handle null values properly
                chatMessages.add(ChatMessage(dateTime!!.toInt(), userMail, userMessage))



Dotnet Core - Getting a warning on 'string.Replace(string, string?)' saying use 'string.Replace(string, string?, System.

By : Tony
Date : March 29 2020, 07:55 AM
this will help just... tell it what comparison type you want; for example, for an ordinal-ignore-case replace:
code :
    .Replace("and", "&", StringComparison.OrdinalIgnoreCase)
    .Replace("substringof", string.Empty, StringComparison.OrdinalIgnoreCase)
    .Replace("(", string.Empty, StringComparison.OrdinalIgnoreCase)
    .Replace(")", string.Empty, StringComparison.OrdinalIgnoreCase)
    .Replace("'", string.Empty, StringComparison.OrdinalIgnoreCase)
    .Replace(" ", string.Empty, StringComparison.OrdinalIgnoreCase)
    .Replace("eq", ",", StringComparison.OrdinalIgnoreCase);
Related Posts Related Posts :
  • Storing integers values from file into a vectors of vector
  • Why `static` functions in different TUs do not break the ODR?
  • Base class and templates
  • boost::asio allow non-blocking accept of new connections while handler for connection is blocking
  • How to write custom comparator for std::minmax function for datatype vector<glm::vec3> (opengl datatype)
  • Confused about * and & with pointers
  • What's the value in memory?
  • Qt - How to handle memory management for dialogs?
  • Why am I having trouble compiling a templated class?
  • Understanding which method will be invoked
  • Why does bool casting is called?
  • Insert string at linking time
  • How to use a C++ lambda to convert a member function pointer to a normal function pointer for use as a callback
  • Is the Intel C++ Compiler (19.0) now only using the Clang front-end (i.e. already abandoned EDG)?
  • Why does deleting the move constructor cause a compile error?
  • How can I make sure my random number between 0 and 1 generated by rand is not 0?
  • How will I pass ranges instead of iterator-pairs in C++20?
  • Use std::optional as a regular pointer vs use has_value() and value
  • How to interlace string with one character?
  • Derived class from Template argument doesn't have protected member access
  • Parallel For Loops: Find if a sorted array contains duplicate elements
  • Casting a reference to a base class: standard behaviour?
  • How to check dllmain function is returning false
  • How to update the attributes of an object?
  • How do I extract an integer in a string?
  • Why code give segmentation fault on inputs greater than 10?
  • Is it possible to access a Public Class Member from outside of the main() where it is created?
  • Why do we need .lib file in case of importing functions from .dll?
  • Why is ranges::ostream_iterator default-constructible?
  • Definition of a C++ variable, section Basic/6
  • How to add arithmetic operators to std::array?
  • Is it possible to to create a vector filled with zeros of size N using template meta programming in c++11
  • Problem about implementation of a stack in C++
  • Which of these pointer comparisons should a conforming compiler be able to optimize to "always false"?
  • Data Structure to represent command packet format
  • Can't find the error in my cpp or header file, class construction failing
  • How can I find substring in a vector in c++
  • Is it possible to pass std::deque's member functions as a parameter?
  • check if elements of a range can be moved?
  • How to pass a function as parameter in C++
  • What is the difference between _malloca and malloc?
  • is there an way to ignore signals signature?
  • Valgrind Invalid Read of Size 8 for insertion sort
  • C++ Template Specialization and Subclassing
  • C++ autoload default constructor on object property
  • Adding node to linked list without explicitly allocating memory space (without using new)
  • Why does "unsigned int" + "unsigned int" return an "unsigned int"?
  • Is there a reason why Clang does not optimize this code?
  • Returning a reference to a class data member and then trying to change that member
  • My code outputs invalid when I input anything
  • Why does a private struct defined in a .h require a scope in a return type in the .cpp file?
  • c++ wrapper for header encapsulation
  • Does a super class need a default constructor?
  • Generate random number and guaranteed to cover all between the given domain?
  • I'm trying to use something other than a boolean function
  • What is the principle for behavior of boost adding month?
  • Is there a way find a key in the whole json file using QJsonObject?
  • Why is my code printing the wrong ciphertext?
  • Forcing inlining of callback (lambda) in C++17 in library
  • How can I use Valgrind to determine the source of "still-available" memory leak?
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk