Tutorial by Examples: t

There are four principle ways to declare a variable in JavaScript: using the var, let or const keywords, or without a keyword at all ("bare" declaration). The method used determines the resulting scope of the variable, or reassignability in the case of const. The var keyword creates a f...

JavaScript variables can hold many data types: numbers, strings, arrays, objects and more: // Number var length = 16; // String var message = "Hello, World!"; // Array var carNames = ['Chevrolet', 'Nissan', 'BMW']; // Object var person = { firstName: "John", ...

String literal types allow you to specify the exact value a string can have. let myFavoritePet: "dog"; myFavoritePet = "dog"; Any other string will give a error. // Error: Type '"rock"' is not assignable to type '"dog"'. // myFavoritePet = "rock&qu...

3.0 let someString = " Swift Language \n" let trimmedString = someString.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()) // "Swift Language" Method stringByTrimmingCharactersInSet returns a new string made by removing from both ends of t...

SleekXMPP (Python) import sleekxmpp client = sleekxmpp.Client("[email protected]", "password") client.connect() client.process(blocking=False) client.send_message(mto="[email protected]", mbody=self.msg) Smack (Java / Android) XMPPTCPConnection connectio...

In addition to functional constructs such as Try, Option and Either for error handling, Scala also supports a syntax similar to Java's, using a try-catch clause (with a potential finally block as well). The catch clause is a pattern match: try { // ... might throw exception } catch { case i...

A method can be converted to a closure using the & operator. def add(def a, def b) { a + b } Closure addClosure = this.&add assert this.add(4, 5) == addClosure(4, 5)

Add a keystore using: keytool -genkey -v -keystore example.keystore -alias example -keyalg RSA -keysize 2048 -validity 10000 Note: This should be at root of project. Though not a hard requirement, it eases the file referencing Add a build.json with release/dev configuration for key...

To view a pdf you can download Adobe reader for free . You can create pdfs programmatically with the help of, e.g by using iTextSharp, jsPDF or PDFSharp (there are other libraries available)

This code writes the string to a file. It is important to close the writer, so this is done in a finally block. public void writeLineToFile(String str) throws IOException { File file = new File("file.txt"); BufferedWriter bw = null; try { bw = new BufferedWriter(ne...

Early Bound (with a reference to Microsoft Scripting Runtime) Sub EnumerateFilesAndFolders( _ FolderPath As String, _ Optional MaxDepth As Long = -1, _ Optional CurrentDepth As Long = 0, _ Optional Indentation As Long = 2) Dim FSO As Scripting.FileSystemObject Set ...

Split Function returns a zero-based, one dimensional array containing a specified number of substrings. Syntax Split(expression [, delimiter [, limit [, compare]]]) PartDescriptionexpressionRequired. String expression containing substrings and delimiters. If expression is a zero-length string(&q...

Inside parent-component.hbs {{yield (hash child=( component 'child-component' onaction=(action 'parentAction') ) )}} Inside parent-component.js export default Ember.Component.extend({ actions: { // We pass this action to the child to call at it's discretion par...

Meteor.call(name, [arg1, arg2...], [asyncCallback]) (1) name String (2) Name of method to invoke (3) arg1, arg2... EJSON-able Object [Optional] (4) asyncCallback Function [Optional] On one hand, you can do : (via Session variable, or via ReactiveVar) var syncCall = Meteor.call("my...

When using non-lazy translation, strings are translated immediately. >>> from django.utils.translation import activate, ugettext as _ >>> month = _("June") >>> month 'June' >>> activate('fr') >>> _("June") 'juin' >>> a...

Create Table mysql> CREATE TABLE account (acct_num INT, amount DECIMAL(10,2)); Query OK, 0 rows affected (0.03 sec) Create Trigger mysql> CREATE TRIGGER ins_sum BEFORE INSERT ON account -> FOR EACH ROW SET @sum = @sum + NEW.amount; Query OK, 0 rows affected (0.06 sec) The CRE...

Prefer dict.get method if you are not sure if the key is present. It allows you to return a default value if key is not found. The traditional method dict[key] would raise a KeyError exception. Rather than doing def add_student(): try: students['count'] += 1 except KeyError: ...

stringVar="Apple Orange Banana Mango" arrayVar=(${stringVar// / }) Each space in the string denotes a new item in the resulting array. echo ${arrayVar[0]} # will print Apple echo ${arrayVar[3]} # will print Mango Similarly, other characters can be used for the delimiter. stringVa...

First, add Mongoid to your Gemfile: gem "mongoid", "~> 4.0.0" and then run bundle install. Or just run: $ gem install mongoid After installation, run the generator to create the config file: $ rails g mongoid:config which will create the file (myapp)/config/mongoid...

Create a model (lets call it User) by running: $ rails g model User which will generate the file app/models/user.rb: class User include Mongoid::Document end This is all you need to have a model (albeit nothing but an id field). Unlike ActiveRecord, there is no migration files. All the...