Tutorial by Examples: i

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...

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...

Assuming you have this YAML locale file: # config/locales/en.yml en: header: title: "My header title" and you want to display your title string, you can do this # in ERB files <%= t('header.title') %> # in SLIM files = t('header.title')

You can pass parameters to I18n t method: # Example config/locales/en.yml en: page: users: "%{users_count} users currently online" # In models, controller, etc... I18n.t('page.users', users_count: 12) # In views # ERB <%= t('page.users', users_count: 12) %> #S...

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 ...

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...

Textual data type: let singleQuotes: string = 'single'; let doubleQuotes: string = "double"; let templateString: string = `I am ${ singleQuotes }`; // I am single

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...

Add one common horizontal line for all categorical variables # sample data df <- data.frame(x=('A', 'B'), y = c(3, 4)) p1 <- ggplot(df, aes(x=x, y=y)) + geom_bar(position = "dodge", stat = 'identity') + theme_bw() p1 + geom_hline(aes(yintercept=5), colour=...

import 'dart:async'; Future main() async { var value = await _waitForValue(); print("Here is the value: $value"); //since _waitForValue() returns immediately if you un it without await you won't get the result var errorValue = "not finished yet"; _waitForValue()...

To convert decimal number to binary format use base 2 Int32 Number = 15; Console.WriteLine(Convert.ToString(Number, 2)); //OUTPUT : 1111 To convert decimal number to octal format use base 8 int Number = 15; Console.WriteLine(Convert.ToString(Number, 8)); //OUTPUT : 17 To conv...

The most feasible way is to use, the DateTime class. An example: <?php // Create a date time object, which has the value of ~ two years ago $twoYearsAgo = new DateTime("2014-01-18 20:05:56"); // Create a date time object, which has the value of ~ now $now = new DateTime("2016...