Tutorial by Examples: f

(function(){ var hashMap = {}; function isAnagram (str1, str2) { if(str1.length !== str2.length){ return false; } // Create hash map of str1 character and increase value one (+1). createStr1HashMap(str1); /...

ForeignKey field is used to create a many-to-one relationship between models. Not like the most of other fields requires positional arguments. The following example demonstrates the car and owner relation: from django.db import models class Person(models.Model): GENDER_FEMALE = 'F' G...

Solves problem of: access denied for user root using password YES Stop mySQL: sudo systemctl stop mysql Restart mySQL, skipping grant tables: sudo mysqld_safe --skip-grant-tables Login: mysql -u root In SQL shell, look if users exist: select User, password,plugin FROM mysql.user ; U...

Fugitive Vim is a plugin by Tim Pope that provides access to git commands that you can execute without leaving vim. Some common commands include: :Gedit - edit a file in the index and write it to stage the the changes :Gstatus - equivalent of git status :Gblame - brings up vertical split of outp...

set var to 2 if var = 2 then say "Var equals 2" end if

set var1 to 5 //set the number to anything if var1 = 5 then say "Var one equals 5" else say "Var one does not equal 5" end if

CREATE INDEX first_name_idx ON user_data (UPPER(first_name)); SELECT * FROM user_data WHERE UPPER(first_name) = 'JOHN2'; Function based index means, creating index based on a function. If in search (where clause), frequently any function is used, it's better to create index based on ...

The NamedParameterJdbcTemplate class adds support for programming JDBC statements using named parameters, as opposed to programming JDBC statements using only classic placeholder ( '?') arguments. The NamedParameterJdbcTemplate class wraps a JdbcTemplate, and delegates to the wrapped JdbcTempl...

Any @Component or @Configuration could be marked with @Profile annotation @Configuration @Profile("production") public class ProductionConfiguration { // ... } The same in XML config <beans profile="dev"> <bean id="dataSource" class="&l...

Protractor Installation and Setup Step 1: Download and install NodeJS from here. Make sure you have latest version of node. Here, I am using node v7.8.0. You will need to have the Java Development Kit(JDK) installed to run selenium. Step 2: Open your terminal and type in the following command to i...

Suppose you need to work on three different projects project A, project B and project C. project A and project B need python 3 and some required libraries. But for project C you need python 2.7 and dependent libraries. So best practice for this is to separate those project environments. For creati...

In order to chain asynchronous operations and avoid a callback hell, Vala supports the yield statement. Used with an asynchronous invocation, it will pause the current coroutine until the call is completed and extract the result. Used alone, yield pause the current coroutine until it's being woken...

class ConversationsTableViewController: UITableViewController, NSFetchedResultsControllerDelegate { private var fetchedResultsController: NSFetchedResultsController<Conversation>! override func viewDidLoad() { super.viewDidLoad() initializeFetchedResultsController() } private...

The most common use of formatting is to control display of numeric information contained in the cells in a consistent format, such as currency, a certain number of digits to the right of the decimal point, etc. There are several categories for numbers, such as Currency, Accounting, Percentage, and ...

If you want to use a podfile in more than one target, you can do like this. You can choose the download address when you pod this lib. def testpods pod 'YSDPush', :git => 'https://github.com/youshaoduo/YSDPush.git' end target 'One' do testpods end target 'Two' do testpods ...

Calendar : Key : Privacy - Calendars Usage Description Value : $(PRODUCT_NAME) calendar events Reminder : Key : Privacy - Reminders Usage Description Value : $(PRODUCT_NAME) reminder use Contact : Key : Privacy - Contacts Usage Description Value : $(PRODUCT_...

In DRF, serializer validation is run in a specific, undocumented order Field deserialization called (serializer.to_internal_value and field.run_validators) serializer.validate_[field] is called for each field. Serializer-level validators are called (serializer.run_validation followed by seriali...

6 class Item { constructor(text, type) { this.text = text; this.emphasis = false; this.type = type; } toHtml() { return `<${this.type}>${this.emphasis ? '<em>' : ''}${this.text}${this.emphasis ? '</em>' : ''}</${this.type}...

In this example we will extract all the web links from a website. I am using http://stackoverflow.com/ for illustration. Here recursion is used, where each obtained link's page is parsed for presence of an anchor tag and that link is again submitted to the same function. The condition if(add &&...

Option Explicit Sub CheckWorksheetsDiagram() Debug.Print Worksheets(1).Name Debug.Print Charts(1).Name Debug.Print Sheets(1).Name End Sub The result: Sheet1 Chart1 Chart1