Tutorial by Examples: b

Generating Random number using apache-common lang3

We can use org.apache.commons.lang3.RandomUtils to generate random numbers using a single line. int x = RandomUtils.nextInt(1, 1000); The method nextInt(int startInclusive, int endExclusive) takes a range. Apart from int, we can generate random long, double, float and bytes using this class. R...

Java Language • Random Number Generation

Something More About base_url

What happens if I don't set base_url ? You will not get any Impotency error to set this and proceed. You can continue without setting, but you should know about HTTP header injection If I did't set it what will show up? You will get http://[::1]/ instead of your actual URL. What does this m...

codeigniter • Base url in Codeigniter

Producing a NuGet package for a library

Any project that targets netstandard1.X can be packed into a NuGet package by running: dotnet pack The resulting package can be uploaded to NuGet, MyGet, or hosted in a local package source.

.net-core • Building libraries with .NET Core

Basic Front Matter in Jekyll

Front matter tells Jekyll to parse a file. You add predefined variables, which are YAML sets, to the front matter. Then, you can use Liquid tags in your files to access the front matter. Front matter is indicated with two triple-dashed lines. You must place the variables between the two triple-dash...

jekyll • Front Matter

Multiple producer/consumer example with shared global queue

Below code showcases multiple Producer/Consumer program. Both Producer and Consumer threads share same global queue. import java.util.concurrent.*; import java.util.Random; public class ProducerConsumerWithES { public static void main(String args[]) { BlockingQueue<Integer> ...

Java Language • Concurrent Programming (Threads)

GitHub Flavored Markdown

GitHub expands Markdown syntax to provide new useful features. Header # Header1 ## Header2 ### Header3 #### Header4 ##### Header5 ###### Header6 H1 === H2 --- Emphasis *Italic1* _Italic2_ **Bold1** __Bold2__ ***Bold_Italic*** ~~Strikethrough~~ Horizontal Line --- *** ___ ...

github • Getting started with github

Config a remote for your fork then sync your fork (master branch)

Config a remote for my fork $ cd my_local_repo $ git remote add upstream https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git # Specify a new remote upstream repository that will be synced with the fork $ git remote -v # Verify the new upstream repository specified for my f...

github • Update a forked Repository

Exporting variables from app modules

// Default export export default {}; // Named export export const SomeVariable = {};

meteor • ES2015 modules (Import & Export)

Exporting symbols from Meteor packages

In your mainModule file: export const SomeVar = {};

meteor • ES2015 modules (Import & Export)

Embedding into HTML

There are three possibilities to insert Elm code into a existing HTML page. Embed into the body tag Supposing you have compiled the Hello World example into elm.js file, you can let Elm take over the <body> tag like so: <!DOCTYPE html> <html> <body> <scri...

Elm Language • Getting started with Elm Language

Creating and calling a library

In order to use libraries in CodeIgniter, you need to create a library. class Pro { function show_hello_world() { return 'Hello World'; } } In this library, which is called is pro.php, this file must be added to the following path. Path: \xampp\htdocs\project\application\librarie...

codeigniter • How to use the CI libraries and helper?

Beginner program

Html has beginnerProgram mostly for learning purposes. beginnerProgram is not capable of handling Subscriptions or running Commands. It is only capable of handling user input from DOM Events. It only requires a view to render the model and an update function to handle state changes. Example Con...

Elm Language • The Elm Architecture

Subroutines

Subroutines hold code. Unless specified otherwise, they are globally defined. # Functions do not (have to) specify their argument list sub returns_one { # Functions return the value of the last expression by default # The return keyword here is unnecessary, but helps readability. return 1...

Perl Language • Subroutines

About PLSQL

PL/SQL stands for Procedural Language extensions to SQL. PL/SQL is available only as an "enabling technology" within other software products; it does not exist as a standalone language. You can use PL/SQL in the Oracle relational database, in the Oracle Server, and in client-side applicati...

plsql • Getting started with plsql

Printing the Difference of the Values of two Pointers to an Object

Subtracting the values of two pointers to an object results in a signed integer *1. So it would be printed using at least the d conversion specifier. To make sure there is a type being wide enough to hold such a "pointer-difference", since C99 <stddef.h> defines the type ptrdiff_t. ...

C Language • Formatted Input/Output

Benchmarking your code - measuring execution time

Most performance tips are very dependent of the current state of JS engines and are expected to be only relevant at a given time. The fundamental law of performance optimization is that you must first measure before trying to optimize, and measure again after a presumed optimization. To measure cod...

JavaScript • Performance Tips

Prefer local variables to globals, attributes, and indexed values

Javascript engines first look for variables within the local scope before extending their search to larger scopes. If the variable is an indexed value in an array, or an attribute in an associative array, it will first look for the parent array before it finds the contents. This has implications wh...

JavaScript • Performance Tips

Hive ACID table creation.

ACID tables are supported since hive 0.14 version. Below table supports UPDATE/DELETE/INSERT Below configuration changes required in hive-site.xml. hive.support.concurrency = true hive.enforce.bucketing = true hive.exec.dynamic.partition.mode = nonstrict hive.txn.manager =org.apache.hadoop...

hive • Create Database and Table Statement

Avoid re-purposing the names of Properties or Methods as your variables

It is generally not considered 'best practice' to re-purpose the reserved names of Properties or Methods as the name(s) of your own procedures and variables. Bad Form - While the following is (strictly speaking) legal, working code the re-purposing of the Find method as well as the Row, Column and ...

excel-vba • VBA Best Practices

Counting rows by group

# example data DT = data.table(iris) DT[, Bin := cut(Sepal.Length, c(4,6,8))] Using .N .N in j stores the number of rows in a subset. When exploring data, .N is handy to... count rows in a group, DT[Species == "setosa", .N] # 50 or count rows in all groups, DT[, .N,...

data.table • Computing summary statistics