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String#split splits a String into an Array, based on a delimiter. "alpha,beta".split(",") # => ["alpha", "beta"] An empty String results into an empty Array: "".split(",") # => [] A non-matching delimiter results in an Array...

Array#join joins an Array into a String, based on a delimiter: ["alpha", "beta"].join(",") # => "alpha,beta" The delimiter is optional, and defaults to an empty String. ["alpha", "beta"].join # => "alphabeta" An em...

Merges two collections to create a distinct collection using the default equality comparer int[] numbers1 = { 1, 2, 3 }; int[] numbers2 = { 2, 3, 4, 5 }; var allElement = numbers1.Union(numbers2); // AllElement now contains 1,2,3,4,5 Live Demo on .NET Fiddle

The easiest way to create a multiline string is to just use multiple lines between quotation marks: address = "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.&quot...

virtualenv is a tool to build isolated Python environments. This program creates a folder which contains all the necessary executables to use the packages that a Python project would need. Installing the virtualenv tool This is only required once. The virtualenv program may be available through yo...

Normally you would want to avoid using cursors as they can have negative impacts on performance. However in some special cases you may need to loop through your data record by record and perform some action. DECLARE @orderId AS INT -- here we are creating our cursor, as a local cursor and only a...

public class DatabaseHelper extends SQLiteOpenHelper { private static final String DATABASE_NAME = "Example.db"; private static final int DATABASE_VERSION = 3; // For all Primary Keys _id should be used as column name public static final String COLUMN_ID = "_id&q...

// You need a writable database to insert data final SQLiteDatabase database = openHelper.getWritableDatabase(); // Create a ContentValues instance which contains the data for each column // You do not need to specify a value for the PRIMARY KEY column. // Unique values for these are automatic...

A struct can be used to bundle multiple return values: C++11 struct foo_return_type { int add; int sub; int mul; int div; }; foo_return_type foo(int a, int b) { return {a + b, a - b, a * b, a / b}; } auto calc = foo(5, 12); C++11 Instead of assignment to indi...

A module is a file containing Python definitions and statements. Function is a piece of code which execute some logic. >>> pow(2,3) #8 To check the built in function in python we can use dir(). If called without an argument, return the names in the current scope. Else, return an alph...

If you've got a session which you wish to destroy, you can do this with session_destroy() /* Let us assume that our session looks like this: Array([firstname] => Jon, [id] => 123) We first need to start our session: */ session_start(); /* We can now remove all the v...

Just execute lsb_release -a. On Debian: $ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux testing (stretch) Release: testing Codename: stretch On Ubuntu: $ lsb_release -a No LSB modules are available. Distributor ID: Ubun...

The most common way to create a Symbol object is by prefixing the string identifier with a colon: :a_symbol # => :a_symbol :a_symbol.class # => Symbol Here are some alternative ways to define a Symbol, in combination with a String literal: :"a_symbol" "a_symbol&quot...

Given a String: s = "something" there are several ways to convert it to a Symbol: s.to_sym # => :something :"#{s}" # => :something

Given a Symbol: s = :something The simplest way to convert it to a String is by using the Symbol#to_s method: s.to_s # => "something" Another way to do it is by using the Symbol#id2name method which is an alias for the Symbol#to_s method. But it's a method that is unique to the...

UIAlertView and UIActionSheet are Deprecated in iOS 8 and Later. So Apple introduced a new controller for AlertView and ActionSheet called UIAlertController , changing the preferredStyle, you can switch between AlertView and ActionSheet. There is no delegate method for it because all button events a...

NSDictionary *inventory = @{ @"Mercedes-Benz SLK250" : @(13), @"BMW M3 Coupe" : @(self.BMWM3CoupeInventory.count), @"Last Updated" : @"Jul 21, 2016", @"Next Update" : self.nextInventoryUpdateString };

NSDictionary *inventory = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:13], @"Mercedes-Benz SLK250", [NSNumber numberWithInt:22], @"Mercedes-Benz E350", [NSNumber numberWithInt:19], @"BMW M3 Coupe", [NSNumber numberWithInt:16],...

To combine an NSArray of NSString into a new NSString: NSArray *yourWords = @[@"Objective-C", @"is", @"just", @"awesome"]; NSString *sentence = [yourWords componentsJoinedByString:@" "]; // Sentence is now: @"Objective-C is just awesome&quo...

There are a variety of ways to download and use D3. Direct Script Download Download and extract d3.zip Copy the resulting folder to where you will keep your project's dependencies Reference d3.js (for development) or d3.min.js (for production) in your HTML: <script type="text/javascri...