Recent Articles Changed
What is the Mime? known also as Media Type

Modified Monday 25-03 09:18

The term Internet media type refers to the type of a resource. In short, it defines its structure. The Internet media type is also known as MIME (Multipurpose Internet Mail Extensions) because the media type definition started with the email mime....

What is the Email Content-Type Header (ie MIME)?

Modified Monday 25-03 09:13

Content-type is a email headers that defines: the type of the body or the type of one of the body parts Where the first parameter is the media type (mime) HTML Plain Text A content that is a mime message (ie rfc822). ie a mail inside...

What is a React Ref?

Modified Saturday 23-03 06:42

A ref is a state object that holds a value in its current property for the entire lifetime of the component. It's used to hold information that isn’t used for rendering. Unlike with state, updating a ref does not re-render your component. It's...

React - Input Element

Modified Saturday 23-03 06:30

This page is the handling of input element in React. These examples are made with a function components. If you still want to see the same example with class component, they are here: The react forms components input accept a value attribute...

Examples of React Input Element with Class component

Modified Saturday 23-03 06:11

This page keeps the example with class component for a input The react forms components input accept a value attribute that is used to implement a controlled component. A React form: written as a class component where the state is controlled...

What are React Forms?

Modified Saturday 23-03 06:09

A React form is the implementation of HTML form elements with HTML React elements It works a little bit differently from other DOM elements in React, because form elements naturally keep some internal state. In React, there are 2 ways to create...

What is an HTML Form?

Modified Saturday 23-03 05:47

A form is an HTML element that represents a user-submittable form. When parsed as HTML, a form element's start tag will imply a p element's end tag just before. The pizza order form (taken from the HTML...

What is a HTML datalist element?

Modified Saturday 23-03 02:35

A datalist is a html element that implements a combobox. You define a set of value permitted (a domain) that may be used in a input element by grouping options. You get autocompletion for free. with a input text element The HTML Result:...


Recent Articles Created
Examples of React Input Element with Class component

Created Saturday 23-03 06:10

This page keeps the example with class component for a input The react forms components input accept a value attribute that is used to implement a controlled component. A React form: written as a class component where the state is controlled...

Card Puncher Data Processing
What is a combobox?

Created Wednesday 20-03 09:23

A combobox is a combo of: an input and a listbox popup. In HTML, the built-in component is known as data list

Card Puncher Data Processing
What are Floating Lists (listbox popup)?

Created Wednesday 20-03 08:16

Floating lists are lists that are presented to the user in a overlay They are also known as listbox popup Type Focus after rendering Dropdown Element in the list Select Element in the list Autocompletion Search box, combobox or text area...

Card Puncher Data Processing
What is Autocompletion?

Created Wednesday 20-03 08:11

Autocompletion is a floating list that: presents to the user possible values that have been chosen from an input to complete or correct it Search autocompletion: when the user is typing a search term in a search box Entity autocompletion:...

React Typescript Children Override Error
How to define the React children type in Typescript?

Created Monday 18-03 10:27

This article will show you how to override/define the type of children of your react component to a specific type in your props. In this example, we have a layout component that expects only buttons as children to create a button bar. The base component...

Data System Architecture
What is a ligature?

Created Tuesday 05-03 01:36

A ligature is a font feature that allows the rendering of an icon glyph simply by using its textual name. A ligature maps a combination of basic characters to represent another character (code point). The replacement is done by the application (in...

React - Caching

Created Thursday 29-02 03:04

This article is caching functionalities in React. There are 2 caching functionalities: for computed values, you would use a memo for a prop function, you would use useCallback. If you pass a function in props to a child component, its reference...

What is a React Node?

Created Monday 26-02 04:51

A react node is a node in the React DOM tree. A node may have the following data type: a React Element a React Fragment a React Portal (floating element) and the base Javascript data type: string, number, boolean, null or undefined. You...


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 Subsystem

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

Card Puncher Data Processing

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

Eniac 1946

Table Recursion Rectangle

Data Modeling

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

Data Modeling

Snowflake
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.

Function Home

Function

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

Function

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

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

Computing Division At The Dept Of The Treasur 1920

Remington Rand Univac

Medieval Counting Table

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 ?

Table

Education isn't something you can finish.

Richard Feynman
Task Runner