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Articles by karthikeya Boyini
Page 76 of 143
How to extract the last 4 characters from NSString?
To extract last 4 characters from a string in swift we can use the internal functions of String class in swift.With new release every time methods have been modified, deprecated, added and improved in swift. Swift provides different methods to achieve the same. Let’s see these ways of doing it with a few examples.Method 1 − SubstringsIn swift three we were allowed to use a method called substring in which we could pass the string, it’s last index and the offset from which we wanted to trim the string.Let’s see an example of the same:var Str1 = "12312$$33@" print(Str1.substring(from:Str1.index(Str1.endIndex, offsetBy: ...
Read MoreHow to access RESTFul services from iOS/iPhone?
To access REST APIs in swift we need to go through a series of steps using the native way of networking in swift, that is using URL sessions and Data Tasks.Rest stands for Representational State Transfer, which defines some set of constraints that are to be used by web services. In swift, we can access web services in the following way.First of all, we need to create a session object, which default configuration.let configuration = URLSessionConfiguration.default let session = URLSession(configuration: configuration)Then we need to create an URL Request of The type we need, it can get, post, delete or put. ...
Read MoreHow to remove duplications from arraylist for listview in Android?
This example demonstrate about How to remove duplications from arraylist for listview in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken name as Edit text, when user click on save button it will store the data into arraylist. Click on refresh button to get the changes of listview.Step 3 − Add ...
Read MoreHow to insert element to arraylist for listview in Android?
This example demonstrate about How to insert element to arraylist for listview in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken name as Edit text, when user click on save button it will store the data into arraylist. Click on refresh button to get the changes of listview.Step 3 − Add ...
Read MoreHow to delete all elements from arraylist for listview in Android?
This example demonstrate about How to delete all elements from arraylist for listview in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken name as Edit text, when user click on save button it will store the data into arraylist. Click on delete ...
Read MoreScraping and Finding Ordered Word in a Dictionary in Python
For solving this problem we need requests module.For installing requests module, we need this command to get executed at command line.pip install requestsScrapingImport requests module.Then we need to fetch data from URL.Using UTF-8 decode the text.Then convert string into a list of words.Ordered FindingTraverse the list of words using loop.Then compare the ASCII value of adjacent character of each word.If the comparison is true then print ordered word otherwise store the unordered word.Example codeimport requests def Words_find(): my_url = ""#put thisurl of .txt files in any website my_fetchData = requests.get(my_url) ...
Read MorePage Rank Algorithm and Implementation using Python
The PageRank algorithm is applicable in web pages. Web page is a directed graph, we know that the two components of Directed graphsare -nodes and connections. The pages are nodes and hyperlinks are the connections, the connection between two nodes.We can find out the importance of each page by the PageRank and it is accurate. The value of the PageRank is the probability will be between 0 and 1.The PageRank value of individual node in a graph depends on the PageRank value of all the nodes which connect to it and those nodes are cyclically connected to the nodes whose ...
Read MoreCreating child process using fork() in Python
Our task is to create a child process and display process id of both parent and child process using fork() function in Python.When we use fork(), it creates a copy of itself, it is a very important aspect of LINUX, UNIX. fork() is mainly applicable for multithreading environment that means the execution of the thread is duplicated created a child thread from a parent thread. When there is an error, the method will return a negative value and for the child process, it returns 0, Otherwise, it returns positive value that means we are in the parent process.The fork() module ...
Read MoreAdding a column that doesn't exist in a query?
Add a column that does not exist in a query, with the help of AS keyword. The syntax is as follows −SELECT yourColumnName1, yourColumnName2, ....N, yourValue AS yourColumnName, ....N' FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table ColumnDoesNotExists -> ( -> UserId int, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.67 sec)ExampleInsert some records in the table using insert command. The query is as follows −mysql> insert into ColumnDoesNotExists(UserId, UserName) values(100, 'Larry'); Query OK, ...
Read MoreCheck if a table is empty or not in MySQL using EXISTS
The following is the syntax to check whether a table is empty or not using MySQL EXISTS −SELECT EXISTS(SELECT 1 FROM yourTableName);ExampleFirst, let us create a table. The query to create a table is as follows −mysql> create table ReturnDemo -> ( -> Id int, -> Name varchar(10) -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ReturnDemo values(100, 'Larry'); Query OK, 1 row affected (0.18 sec) mysql> insert into ReturnDemo values(101, 'Bob'); Query OK, 1 row affected (0.28 sec) ...
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