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I am gonna assume you already know about adding gradle dependencies firebase in android studio. If you don't just follow the guide from here. Add your app in firebase console, gradle sync android studio after adding dependencies. All dependencies are not needed just firebase database and firebase au...

Take a use case, like a chat app or a collaborative grocery list app (that basically requires a list of objects to be synced across users). If you use firebase database and add a value event listener to the chat parent node or grocery list parent node, you will end with entire chat structure from th...

When you have a huge JSON database, adding a value event listener doesn't make sense. It will return the huge JSON and parsing it would be time consuming. In such cases we can use pagination and fetch part of data and display or process it. Kind of like lazy loading or like fetching old chats when u...

In [1]: df = pd.DataFrame({'A': [1, 2, 3], 'B': [1.0, 2.0, 3.0], 'C': ['a', 'b', 'c'], 'D': [True, False, True]}) In [2]: df Out[2]: A B C D 0 1 1.0 a True 1 2 2.0 b False 2 3 3.0 c True Getting a python list from a series: In [3]: df['...

When we put the control of Label, the Label does not provide any event. <Label x:Name="lblSignUp Text="Dont't have account?"/> as shown the Label only display purpose only. When the user want to replace Button with Label, then we give the event for Label. As shown below: XA...

Magento is a very popular eCommerce application. It offers a great deal of customization and abilities from initial install. Here are a few suggestions for optimizing a Magento installation. Enabling Output Compression In your .htaccess file for Magento you will find a section of text starting wit...

First-time visitors to any web page has to make several HTTP requests. By using the “Expires” header you make the components of the requests cacheable. This avoids unnecessary HTTP requests on subsequent page views. You want to find the area of the .htaccess file that starts with <IfModulemod_ex...

Merge JS and CSS Files This particular tweak will reduce the number of HTTP requests on your eCommerce site. [box type=”alert” border=”full”]Note: This can sometimes break some applications. After performing the following steps, please ensure that the site still performs as it did before enabling ...

The model Magento uses to store customer and product data results in longer than average SQL queries and more reads. Enabling the Flat Catalog option for Categories and Products will merge product data into one table, therefore improving performance. Login to your administration area and go to – Sy...

Login to your administration area and go to – System > Cache Management Next, click on the Select All link Finally, make sure the Actions is set to Enable and click submit Disable Error Logging Login to your administration area and go to – System > Configuration > Developer Under ...

The task is to find the length of the longest subsequence in a given array of integers such that all elements of the subsequence are sorted in ascending order. For example, the length of the longest increasing subsequence(LIS) for {15, 27, 14, 38, 26, 55, 46, 65, 85} is 6 and the longest increasing ...

Controller::renderAjax() method can be used to respond to an Ajax request. This method is similar to renderPartial() except that it will inject into the rendering result with JS/CSS scripts and files which are registered with the view Assume we have login form in a view file: <?php use yii\hel...

Given a string what is the longest palindromic subsequence(LPS) of it? Let's take a string agbdba. The LPS of this string is abdba of length 5. Remember, since we're looking for subsequence, the characters need not to be continuous in the original string. The longest palindromic substring of the seq...

In order to search for packages in the databse, searching both in packages' names and descriptions: pacman -Ss string1 string2 ... To install a single package or list of packages (including dependencies), issue the following command: sudo pacman -S package_name1 package_name2 ... source

This Documentation is a small summary of the offical one Prerequisites Your PC must be running a 64-bit version of Windows 10 Anniversary Update build 14393 or later To find your PC's CPU architecture and Windows version/build number, open Settings>System>About. Look for the OS Build ...

This chapter describes how to set up a Docker Container with Jenkins inside, which is capable of sending Docker commands to the Docker installation (the Docker Daemon) of the Host. Effectively using Docker in Docker. To achieve this, we have to build a custom Docker Image which is based on an arbitr...

Given coins of different denominations and a total, in how many ways can we combine these coins to get the total? Let's say we have coins = {1, 2, 3} and a total = 5, we can get the total in 5 ways: 1 1 1 1 1 1 1 1 2 1 1 3 1 2 2 2 3 The problem is closely related to knapsack problem. The o...

Given coins of different denominations and a total, how many coins do we need to combine to get the total if we use minimum number of coins? Let's say we have coins = {1, 5, 6, 8} and a total = 11, we can get the total using 2 coins which is {5, 6}. This is indeed the minimum number of coins require...

This tag is a duplicate of playframework. Please post any content that you would post here in that tag, with the version set to “2.0”

You can configure Mail by just adding/changing these lines in the app's .ENV file with your email provider login details, for example for using it with gmail you can use: MAIL_DRIVER=smtp MAIL_HOST=smtp.gmail.com MAIL_PORT=587 [email protected] MAIL_PASSWORD=yourPassword MAIL_E...