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An anonymous method can be assigned wherever a delegate is expected: Func<int, int> square = delegate (int x) { return x * x; } Lambda expressions can be used to express the same thing: Func<int, int> square = x => x * x; In either case, we can now invoke the method stored ins...

Func also supports Covariant & Contravariant // Simple hierarchy of classes. public class Person { } public class Employee : Person { } class Program { static Employee FindByTitle(String title) { // This is a stub for a method that returns // an employee that h...

This example demonstrates how to fetch the URI's of system ringtones (RingtoneManager.TYPE_RINGTONE): private List<Uri> loadLocalRingtonesUris() { List<Uri> alarms = new ArrayList<>(); try { RingtoneManager ringtoneMgr = new RingtoneManager(getActivi...

This example shows how to use a request interceptor with OkHttp. This has numerous use cases such as: Adding universal header to the request. E.g. authenticating a request Debugging networked applications Retrieving raw response Logging network transaction etc. Set custom user agent Retrof...

For any object (i.e, variable, array, union, struct, pointer or function) the unary address operator can be used to access the address of that object. Suppose that int i = 1; int *p = NULL; So then a statement p = &i;, copies the address of the variable i to the pointer p. I...

Please see here: Pointer Arithmetic

An immutable object is an object whose state cannot be changed. An immutable class is a class whose instances are immutable by design, and implementation. The Java class which is most commonly presented as an example of immutability is java.lang.String. The following is a stereotypical example: ...

The double-colon syntax of names in the use statement looks similar to names used elsewhere in the code, but meaning of these paths is different. Names in the use statement by default are interpreted as absolute, starting at the crate root. Names elsewhere in the code are relative to the current mo...

You can let I18n handle pluralization for you, just use count argument. You need to set up your locale file like this: # config/locales/en.yml en: online_users: one: "1 user is online" other: "%{count} users are online" And then use the key you just created by ...

In most cases, you may want to set I18n locale. One might want to set the locale for the current session, the current user, or based on a URL parameter This is easily achievable by implementing a before_action in one of your controllers, or in ApplicationController to have it in all of your controll...

Anonymous methods provide a technique to pass a code block as a delegate parameter. They are methods with a body, but no name. delegate int IntOp(int lhs, int rhs); class Program { static void Main(string[] args) { // C# 2.0 definition IntOp add = delegate(int lhs,...

Array.join(separator) can be used to output an array as a string, with a configurable separator. Default (separator = ","): ["a", "b", "c"].join() === "a,b,c" With a string separator: [1, 2, 3, 4].join(" + ") === "1 + 2 + 3 + 4&q...

<?xml version="1.0" encoding="utf-8" ?> <Employees> <Employee> <EmpId>1</EmpId> <Name>Sam</Name> <Sex>Male</Sex> <Phone Type="Home">423-555-0124</Phone> <Phone Type="Work&quot...

# this method can be anything and anywhere as long as it is accessible for connection @pyqtSlot() def run_on_complete(): pass # An object containing methods you want to run in a thread class Worker(QObject): complete = pyqtSignal() @pyqtSlot() def a_method_to_run...

A boolean represents the most basic datatype in TypeScript, with the purpose of assigning true/false values. // set with initial value (either true or false) let isTrue: boolean = true; // defaults to 'undefined', when not explicitely set let unsetBool: boolean; // can ...

If you have no type at all, commonly used for functions that do not return anything: function log(): void { console.log('I return nothing'); } void types Can only be assigned null or undefined.

Number formatting, grouping digits according to the localization. const usNumberFormat = new Intl.NumberFormat('en-US'); const esNumberFormat = new Intl.NumberFormat('es-ES'); const usNumber = usNumberFormat.format(99999999.99); // "99,999,999.99" const esNumber = esNumberFormat.form...

Currency formatting, grouping digits and placing the currency symbol according to the localization. const usCurrencyFormat = new Intl.NumberFormat('en-US', {style: 'currency', currency: 'USD'}) const esCurrencyFormat = new Intl.NumberFormat('es-ES', {style: 'currency', currency: 'EUR'}) const u...

Date time formatting, according to the localization. const usDateTimeFormatting = new Intl.DateTimeFormat('en-US'); const esDateTimeFormatting = new Intl.DateTimeFormat('es-ES'); const usDate = usDateTimeFormatting.format(new Date('2016-07-21')); // "7/21/2016" const esDate = esDateT...

import 'dart:convert'; void main() { var jsonString = """ { "cats": { "abysinnian": { "origin": "Burma", "behavior": &qu...