Tutorial by Examples: ar

Clearing a Map

To remove all elements from a Map, use the .clear() method: map.clear(); Example: const map = new Map([[1, 2], [3, 4]]); console.log(map.size); // 2 map.clear(); console.log(map.size); // 0 console.log(map.get(1)); // undefined

JavaScript • Map

Shrink the code with ProGuard

To enable code shrinking with ProGuard, add minifyEnabled true to the appropriate build type in your build.gradle file. android { buildTypes { release { minifyEnabled true proguardFiles getDefaultProguardFile(‘proguard-android.txt'), 'pro...

android-gradle • Shrink Code and Resources

var

An implicitly-typed local variable that is strongly typed just as if the user had declared the type. Unlike other variable declarations, the compiler determines the type of variable that this represents based on the value that is assigned to it. var i = 10; // implicitly typed, the compiler must de...

C# Language • Keywords

Equals and GetHashCode in IEqualityComparator

For given type Person: public class Person { public string Name { get; set; } public int Age { get; set; } public string Clothes { get; set; } } List<Person> persons = new List<Person> { new Person{ Name = "Jon", Age = 20, Clothes = "some clothes...

C# Language • Equals and GetHashCode

Character Strings

char varchar text

Microsoft SQL Server • Data Types

Unicode Character Strings

nchar nvarchar ntext

Microsoft SQL Server • Data Types

Binary Strings

binary varbinary image

Microsoft SQL Server • Data Types

Rendering text along an arc.

This example shows how to render text along an arc. It includes how you can add functionality to the CanvasRenderingContext2D by extending its prototype. This examples is derived from the stackoverflow answer Circular Text. Example rendering Example code The example adds 3 new text renderi...

html5-canvas • Text

Render a rounded polygon.

Creates a path from a set of points [{x:?,y:?},{x:?,y:?},...,{x:?,y:?}] with rounded corners of radius. If the corner angle is too small to fit the radius or the distance between corners does not allow room the corners radius is reduced to a best fit. Usage Example var triangle = [ { x: 200...

html5-canvas • Polygons

Understanding C++ string characteristics

#include <iostream> #include <string> int main() { const char * C_String = "This is a line of text w"; const char * C_Problem_String = "This is a line of text ኚ"; std::string Std_String("This is a second line of text w"); std::string...

C++ • Internationalization in C++

Getting Started

What is .postMessage(), when and why do we use it .postMessage() method is a way to safely allow communication between cross-origin scripts. Normally, two different pages, can only directly communicate with each other using JavaScript when they are under the same origin, even if one of them is emb...

JavaScript • .postMessage() and MessageEvent

SmartGit

Website: http://www.syntevo.com/smartgit/ Price: Free for non-commercial use only. A perpetual license costs 99 USD Platforms: Linux, OS X, Windows Developed by: syntevo

Git • Git GUI Clients

Moving objects around in the list

The Collections class allows for you to move objects around in the list using various methods (ls is the List): Reversing a list: Collections.reverse(ls); Rotating positions of elements in a list The rotate method requires an integer argument. This is how many spots to move it along the line b...

Java Language • Lists

Creating a Comparator using comparing method

Comparator.comparing(Person::getName) This creates a comparator for the class Person that uses this person name as the comparison source. Also it is possible to use method version to compare long, int and double. For example: Comparator.comparingInt(Person::getAge) Reversed order To create ...

Java Language • Comparable and Comparator

Create a DataFrame from a list of dictionaries

A DataFrame can be created from a list of dictionaries. Keys are used as column names. import pandas as pd L = [{'Name': 'John', 'Last Name': 'Smith'}, {'Name': 'Mary', 'Last Name': 'Wood'}] pd.DataFrame(L) # Output: Last Name Name # 0 Smith John # 1 Wood Mary Missin...

pandas • Creating DataFrames

creating a UDT with a single int column that is also a primary key

CREATE TYPE dbo.Ids as TABLE ( Id int PRIMARY KEY )

Microsoft SQL Server • User Defined Table Types

Creating a UDT with a primary key and a column with a default value:

CREATE TYPE MyUniqueNamesType as TABLE ( FirstName varchar(10), LastName varchar(10), CreateDate datetime default GETDATE() PRIMARY KEY (FirstName,LastName) )

Microsoft SQL Server • User Defined Table Types

Array of literals

Formula in A1 ={"Item name","Quantity";"Apples",2;"Blueberries",5} Important: In certain countries the comma is used as a decimal separator (e.g: €1,00). If that's your case, you would need to use backslashes ( \ ) instead: (Docs) ={"Item name"\...

google-spreadsheet • Using arrays in Google Sheets

Getting started with a simple map

<html> <head> <title>Getting started</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.17.1/ol.css" type="text/css"> <script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.17.1/ol...

openlayers-3 • Getting started with openlayers-3

Using a table valued parameter to insert multiple rows to a table

First, define a used defined table type to use: CREATE TYPE names as TABLE ( FirstName varchar(10), LastName varchar(10) ) GO Create the stored procedure: CREATE PROCEDURE prInsertNames ( @Names dbo.Names READONLY -- Note: You must specify the READONLY ) AS INSERT INTO d...

Microsoft SQL Server • Table Valued Parameters