Recent Articles Changed

Code Quality - Code analysis

Modified Mar 17 - 10:13

Code analysis is an application that scans code and reports : problems or improvement The application performing code analysis is a linter (a parser/lexer program) Example: Bad variable name writing Bad name writing is a problem that occurs when th "...

Language - Linter (Code Analysis, Validation)

Modified Mar 17 - 10:09

A linter is a tool that: statically analyze code finds problems in them may enforce a coding style. syntax highlighting Example implementation Bad variable name writing Bad name writing is a problem that occurs when the developer makes a mistake "...

Video / Motion / Animation / Film

Modified Mar 13 - 14:18

A video is : a sequence of image called frame shown at the frequency called frequence rate (per second) compressed to follow a bitrate. Movies at first were called moving pictures. A good example to see is the

What are images? (also known as pictures)

Modified Mar 13 - 12:53

An image (from Latin: imago) is an object that depicts visual perception, such as: a photograph or other two-dimensional picture, Example of images and their dimensions Name Dimension Album CoverRaster graphics (also called bitmapVector graphicsMus "...

How to profile with the PHP Xdebug Profiler

Modified Mar 11 - 09:21

The profiler in Xdebug outputs profiling information in the form of a cachegrind compatible file. Steps Xdebug installed and configured Install xdebug and set the profiler php.ini configu "...

Tree - Parent

Modified Mar 10 - 19:33

A parent is a node that has: children (ie nodes below it). (equivalent to) a branch below it. Each element (node) in a tree has exactly one parent, with the exception of the root element, which has none. For a child, it's the first ancestor (ie fi "...

HTML - Body element

Modified Mar 09 - 16:08

HTML The body element represents the body of a document (as opposed to the document’s metadata). DOM Accessor The document property document.body returns the body element. Can be set, to replace the body element. The body element of a document is "...

DOM - Body

Modified Mar 09 - 15:50

The body node in the DOM tree represents the HTML body element. Management Access You access the body node via the document node as property. Example: getComputedcomputed style value Documentation / Reference Document/body

Recent Articles Created

Code Shipping - Definition File (Declaration File, Stubs)

Created Feb 24 - 16:33

dynamic languages does not have any type system (by default). (a variable may store any kind of value. To overcome this situation, developers create definition files that defines a library in terms of class, function and type signaturecode completioc...

Php - Stubs

Created Feb 24 - 16:28

PHP is a dynamic language. It does not have a type system (by default) and therefore, a variable stores any kind of value (if the type is not declared). To overcome this situation, developers may create definition file known in PHP as stubs files con...

Sql Chaining explained

Created Feb 16 - 08:35

All operations on a table return a table. A select query returns a table A view returns a table A common table expression returns a table The operations on tables can therefore be chained together (ie pipelined) The Relational algebra expressions...

How to generate data Just With Sql ?

Created Feb 16 - 08:10

data generation with just sql is based on then generation of integer sequence via recursive query Example: for mysql:

Vertx - Future Example

Created Jan 27 - 16:15

CompletableFuture CompletableFuture to wait that an execution finish.

Question Mark

Created Jan 27 - 10:02

: indicate a question is one of the oldest punctuation marks. Some theorize that it's actually an abbreviation for the Latin word “quaestio”, but there is no evidence for this. It has had many different forms over the centuries.

Punctuation Mark

Created Jan 27 - 09:59

are character used to add metadata (extra meaning) to a text. List More ... see this thread

Exclamation Mark

Created Jan 27 - 09:58

is a punctuation mark History It possibly comes from the Latin phrase io, which was an expression of joy. 14th-century Medieval writers placed this at the end of sentences for emphasis. Eventually, the I was placed above the O!

Data all the way

Always keep one hand firmly on data, Amos liked to say.

Data is what set psychology apart from philosophy, and physics from metaphysics.

Amos Tversky (The undoing project)

Data Warehouse Subsystems

Developing a data warehouse means assembling a lot of subsystems in order to create a whole and coherent data application.

Discovers the 34 Kimball Subsystems and drill down to discover them

Data Warehouse Subsystems

Data Processing

Data processing has changed a lot since 1940 :) and luckily, we are not using punch card anymore.

Stream processing is becoming the norm in data integration task while batch processing stays the king in data analysis.

Data Processing

ENIAC, 1946

The first fully electronic digital computer

Data Modeling

Data Modeling is the translation of process into the world of data. The process is tricky but not insurmountable.

Data Modeling

Dimensional Data Modeling

Dimensional Data Modeling permits you to model a (hyper)cube and analyse a process through different perspective. You define dimensions, measures and metrics.

Dimensional Data Modeling

Most programs process some input to produce some output; that’s pretty much the definition of computing.


A Function is the basic block of all reusable code component. It is also becoming the central component of any serverless architecture.


Knowledge isn't free. You have to pay attention.

Computing Division at the Department of the Treasury, mid 1920s

Table / Relation

The table format (known also as a relation) is the most important data structure used in data analysis. Did you know that its name originate from the medieval counting table ?


Education isn't something you can finish.

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