logo
down
shadow

Performance impact of retrieving a element from a List


Performance impact of retrieving a element from a List

By : Rohan Adlakha
Date : November 21 2020, 07:38 AM
I hope this helps you . I don't think there exist single answer to your question, its broad and you can consider all the answers. Basically, you need to understand time complexity of HashMap and ArrayList and that would give you an idea on how your code is going to perform.
The following image (source) gives you an idea of time complexity O(1), O(log n), O(n), ...
code :
get() and put() - usually O(1) but O(n) worst case scenario
add() - O(1)
remove() - O(n)
get() - O(1)
contains() - O(n) (traversal)


Share : facebook icon twitter icon
Performance impact of flatten and reduce - without intermediary list creation

Performance impact of flatten and reduce - without intermediary list creation


By : Saideep
Date : March 29 2020, 07:55 AM
Hope this helps Given the following code: , One more possible implementation (without list duplication):
code :
def optMin(a: Option[Int], b: Option[Int]): Option[Int] =
  (a, b) match {
    case (Some(x), Some(y)) => Option( x min y)
    case (sx, None)         => sx
    case (None, sy)         => sy
    case _                  => None
   }

li.reduceLeft { optMin(_, _) }
performance impact of long list of catch c++

performance impact of long list of catch c++


By : C. Wallace
Date : March 29 2020, 07:55 AM
will help you It depends on the C++ runtime library, but in general having a long list of catch blocks will result in O(n) performance as the implementation performs a linear scan, matching the thrown exception type against each of the types in the list of catch blocks in turn; this is e.g. how libstdc++ (the default C++ runtime on Linux) works.
I don't know whether any other runtime libraries optimize this, but I'd suspect they wouldn't, as a long list of exception blocks would usually be considered a "code smell" and also since the implementation is required to ensure that the first matching catch block receives the exception, which makes a linear scan the natural implementation.
code :
struct ExceptionA : std::exception {};
// etc.

static std::unordered_set<std::type_index> const retryables{
  typeid(ExceptionA),
  typeid(ExceptionB),
  typeid(ExceptionC)
};

bool isRetryable ( std::exception_ptr ex) {
    try {
        if(ex) {
            std::rethrow_exception (ex);
        }
        return true;
    } catch (const std::exception& ex) {
        return retryables.count(typeid(ex));
    }
}
Im facing Big performance impact on IEnumerable(LINQ) > List(RecyclerView)

Im facing Big performance impact on IEnumerable(LINQ) > List(RecyclerView)


By : ftok
Date : March 29 2020, 07:55 AM
With these it helps My project is a commercial project I cannot post here, but the code procedure is: , Im find out problems by myself:
Does a hidden/transparent element impact rendering performance?

Does a hidden/transparent element impact rendering performance?


By : sanityrepresent
Date : March 29 2020, 07:55 AM
hope this fix your issue TL;DR:
In general, a rendered element affects page performance when changes to it trigger repaint on subsequent elements in DOM or when it triggers resize on its parent(s), as resize can get expensive from being fired up to 100 times/second, depending on device.
code :
`opacity` average: 110.71340000000076ms | count: 100
`display` average: 155.47145000000017ms | count: 100
$(window).on('load', function () {
  let displayAvg = 0, displayCount = 0,
      opacityAvg = 0, opacityCount = 0;
  for (let i = 0; i < 10000; i++) {
    $('body').append($('<div />', {
      class: 'modal',
      html:'10k &times; modal instances'
    }))
  }
  $(document)
    .on('click', '#display', function () {
      $('.modal').removeClass('opacity');
      let t0 = performance.now();
      $('.modal').toggleClass('display');
      setTimeout(function () {
        let t1 = performance.now();
        displayAvg += (t1 - t0);
        console.log(
          '`display` toggle took ' + 
          (t1 - t0) +
          'ms \n`display` average: ' + 
          (displayAvg / ++displayCount) + 
          'ms | count: ' + 
          displayCount
        );
      })
    })
    .on('click', '#opacity', function () {
      $('.modal').removeClass('display');
      let t0 = performance.now();
      $('.modal').toggleClass('opacity');
      setTimeout(function () {
        let t1 = performance.now();
        opacityAvg += (t1 - t0);
        console.log(
          '`opacity` + `pointer-events` toggle took ' + 
          (t1 - t0) + 
          'ms \n`opacity` average: ' + 
          (opacityAvg / ++opacityCount) + 
          'ms | count: ' + 
          opacityCount
        );
      });
    })
});
body {
  margin: 0;
}
.buttons-wrapper {
  position: relative;
  z-index: 1;
  margin-top: 3rem;
}
.modal {
  height: 100vh;
  width: 100vw;
  position: fixed;
  top: 0;
  left: 0;
  padding: 1rem;
}
.modal.display {
  display: none;
}
.modal.opacity {
  opacity: 0;
  pointer-events: none;
}
.as-console-wrapper {
  z-index: 2;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="buttons-wrapper">
  <button id="display">Toggle `display`</button>&nbsp;
  <button id="opacity">Toggle `opacity` + `pointer-events`</button>
</div>
Does adding many css classes to an element lead to any performance impact?

Does adding many css classes to an element lead to any performance impact?


By : Omar S
Date : March 29 2020, 07:55 AM
help you fix your problem You're adding 7 bytes of HTML, this is effectively 0 impact on your site, and the CSS processes that so fast again, effectively 0 impact on your site.
That said, this isn't really the appropriate way to go about CSS. I was guilty of this for a while too, but I started following better practices.
code :
<main>
  <div class="p10 vam d_ib blk internal bigshadow"></div>
  <div class="p10 vam d_ib blk internal bigshadow"></div>
  <div class="p10_20 vam d_ib blk accent-blue internal bigshadow"></div>
</main>

.p10 { padding: 10px; }
.p10_20 { padding: 10px 20px; }
.vam { vertical-align: middle; }
.d_ib { display: inline-block; }
.internal { background: #fff; }
.blk { color: #000; }
.bigshadow { box-shadow: 0 10px 15px -8px rgba(0,0,0,.5); }
<main>
    <div class="container"></div>
    <div class="container"></div>
    <div class="container accent"></div>
</main>
/* This or main > div */
main .container {
    padding: 10px;
    display: inline-block;
    color: #000;
    box-shadow: 0 10px 15px -8px rgba(0,0,0,.5);
}

.container.accent {
    padding: 10px 20px;
    border: 2px solid #0095ee;
}
Related Posts Related Posts :
  • How to query using objectify in Google App Engine app
  • List value is printing address instead of value
  • StringUtils.isBlank return false for null Strings
  • Sent parameter through PATCH android
  • i am not able to clear the code below given using throwable concept in java
  • How to get System time instead of Server time in java?
  • How to push json data into an arrya object in MONGO DB by java
  • Saving RelationshipEntity not working
  • Error on "instanceOf" when checking a subClass
  • Java - Splitting a image into 4 images
  • "Pinging" a server in Java
  • RoboGuice Proguard CreationException
  • Android Array list returns Null after adding values
  • Jar Executable what am I doing wrong?
  • How do I mitigate Connection leak triggered for connection com.mysql.jdbc.JDBC4Connection@11d08960,
  • How do i iterate values from a 2d array using conditions
  • Hide Button in CustomPagerAdapter
  • Java GC: does it ever make sense to call super.finalize() in a class that only extends Object?
  • 64bit HashMap in Java
  • Hibernate wildcard query on two columns
  • Want to Generate Auto Login Program Using Java
  • Spring security Oauth 2 with ajax login and form login
  • Parse findInBackground doesn't add to global arraylist?
  • Remove random item from ArrayList
  • in SpringMVC getMessage from i18n properties in a function outside the controller
  • How do I add JCheckBox next to each name that has been entered into an arraylist from a JTextField?
  • Return node ID along with complete node
  • InvocationTargetException. Cannot cast class X to class X. When invoked in Scala Imain through spark-submit
  • how to print elements of a 1D array into a N x N box
  • How to map csv file to pojo class in java
  • How, in Java, to encode default vhost %2F in URL/URI so it doesn't get changed to slash and fail to work
  • Tomcat 5.5 https configuration in Windows Server 2008 64bit
  • Enabling FIPS 140-2 compliance mode in MULE ESB
  • How to pass String PackageName to PkgName under parseXML() and run XMLParser class as a new activity when click on list
  • Error while creating spring -hibernate configuration file
  • Hand off control between java threads
  • NoClassDefFoundError: scala/collection/Seq
  • Getting stack overflow error on one machine but not the other on the same code
  • How can I loop AsyncAjaxRequest in GWT?
  • Failed to find provider info for urbanairship.provider
  • Android ListView Adapter Crash issue/Duplicates
  • Displaying Splash screen only once on user preference
  • Loop List<WebElement> doesn't stop despite no more WebElements
  • Check if pattern exists in a String
  • Swing - Key Problems (Arrow Keys, Tab, etc.) in GUIs with TextComponents
  • Why the solution for binary search tree validity is not working?
  • Double encrypting 2048 RSA?
  • create junit test for runnable class
  • Unable to read and sort information from a text file in Java
  • My device isn't getting detected in android studio (driver issue)
  • Representing a Graph in Java
  • How to XML mapping using jxls
  • Quick Sort stackoverflow error for large arrays
  • Parsing Apache Tika XML Output returns Unknown Tag
  • java simple UI loop, can't find bug
  • how to use greater than and less than in a single if statement in java
  • Error:(27, 13) Failed to resolve: com.antonyt.infiniteviewpager:library:1.0.0
  • Gradle dependencies on source set of different projects
  • Session Scope in Restful Spring Services
  • Java: Change a value in an overridden method of a different class to a value that was calculated in the class
  • shadow
    Privacy Policy - Terms - Contact Us © animezone.co