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Reversing a linked list in Java, recursively
I have been working on a Java project for a class for a while now. It is an implementation of a linked list (here called AddressList , containing simple nodes called ListNode ). The catch is that everything would have to be done with recursive algorithms. I was able to do everything fine sans one ...
Appending to an object
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This answer expects you to know the id of the alert to be added. Well, if you already know that, then you can simply follow the original object format and do: alerts[3] = { app: 'hello3', message: 'message 3' }. With this you can access a message by id:...
How does cookie based authentication work?
...y won't see your users' actual passwords.
Step 3: Client > User login
Now your user logs in. He/she provides their username/password and again, this is posted as a HTTP request to the server.
Step 4: Server > Validating login
The server looks up the username in the database, hashes the sup...
Get next / previous element using JavaScript?
...e a collection.
var divs = document.getElementsByTagName("div");
//divs now contain each and every div element on the page
var selectionDiv = document.getElementById("MySecondDiv");
So basically with selectionDiv iterate through the collection to find its index, and then obviously -1 = previous...
What is a lambda expression in C++11?
...ard benefits heavily from lambdas and raises the usability several bars as now users don't have to clutter their code with small functors in some accessible scope.
C++14
In C++14 lambdas have been extended by various proposals.
Initialized Lambda Captures
An element of the capture list can now b...
How do you version your database schema? [closed]
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I admit it took a while to get right but now it requires almost no effort to prep an upgrade and even less to perform one. Also, one thing I like is that I can do interim hotfix changes and it has no impact on the upgrade procedure. Each upgrade is a fresh new DB....
How to “crop” a rectangular image into a square with CSS?
I know that it is impossible to actually modify an image with CSS, which is why I put crop in quotes.
10 Answers
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Debugging sqlite database on the device
...his will copy your db-file to the root of your SD card / external storage. Now you can easily get it from there by using file manager, adb pull or whatever else you like. Note that with this approach, there is NO need for your app to have WRITE_EXTERNAL_STORAGE permission, as the copying is done by ...
Convert PEM to PPK file format
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Use PuTTYGen
Creating and Using SSH Keys
Overview
vCloud Express now has the ability to create SSH Keys for Linux servers. This function will allow the user to create multiple custom keys by selecting the "My Account/Key Management" option. Once the key has been created the user will be re...
Why is processing a sorted array faster than processing an unsorted array?
... by Mecanismo, via Wikimedia Commons. Used under the CC-By-SA 3.0 license.
Now for the sake of argument, suppose this is back in the 1800s - before long distance or radio communication.
You are the operator of a junction and you hear a train coming. You have no idea which way it is supposed to go. Y...