Xah Programing Blog Archive 2022-06

• JS: Export

• Python: Copy Nested List, Shallow Copy vs Deep Copy

• History of Python Logo

• Logo Design in Software Industry

JavaScript edition: the struct and int of comp programing

• Book: Structure and Interpretation of Computer Programs (SICP), Scheme LISP and JavaScript

misc minor updates

• Programing Language: Unicode Math Symbols in Function Name and Operator
• Unicode: Letter Character
• Problems of Symbol Congestion in Computer Languages; ASCII Jam vs Unicode
• Programing Language Design: Why You Need Operators

• JSON Data Format
• JS: JSON (namespace)

• Windows: Set Chinese Pinyin to Dvorak Layout

• Python For-Else Loop Sucks
• Why Python Sucks

• Why Microsoft Windows Sucks
• Windows 10 Flat Design Sucks
• User Interface Design: Windows Dark Theme Problem
• Windows Onscreen Keyboard Sucks
• Windows Taskbar Sucks
• Worst World Clock User interface Design
• Windows User Interface: Switch Window Problem
• Windows User Interface Design: Accidental Hide Windows
• Windows User interface System Sound Sucks
• Windows User interface Appearance Inconsistency
• Windows 10 Still Using Bitmap Font
• Why Windows User Interface Suck
• Windows User Interface Sucks, Multi Way to Do the Same Thing
• Windows Elevation Prompt Idiocy
• Windows Lockscreen Background Image Problem

updated obs. now error:

your current video card driver does not support this NVENC version

12:32:43.916: error:   Driver does not support the required nvenc API version. Required: 11.1 Found: 11.0

• C:/Users/xah/AppData/Roaming/obs-studio/logs

currently, revisit the insufferable windows faak Saga of Updating Nvidia Driver

• How to Update Nvidia Driver
• Saga of Updating Nvidia Driver

• Wolfram: Equality Test
• Wolfram: No Reference Concept in List
• Wolfram language Tutorial by Video

• JS: Range Function for Array 📜
• JS: Array.prototype.fill
• JS: Array.from
• JS: Array Constructor
• JS: Array.prototype.length

• Wolfram Language Speed Guide

• Wolfram: Local Variable
• Wolfram: List. Get Parts
• Wolfram: List. Add Element
• Wolfram: List. Delete Element
• Wolfram: List. Join, Union, Intersection, Difference

• Ruby: Version Release Dates

• JS: Reverse Key/Value of Map

• Variable Naming: English Words Considered Harmful
• Parameter names start with phi φ, variable names start with xi ξ
• The Sigils WAR, Language Design and Coding Convention
• Elisp: What's Dollar Sign $Name, at Sign @Name

• Atom Webfeed (RSS) Tutorial

• Lazy Eval in WolframLang

upates.

• History of the JavaScript script Tag
• JS: HTML-Like Comment
• JS: Version History

• Wolfram: Recursion
• Wolfram: Iteration
• Wolfram: List. Get Parts
• Mathematica Version 3 to Version 7 Conversion Notes

updates and new

• Git: Commit Files
• Git: Undo Add File
• Git: Undo Commit
• Git: Fix Last Commit Message
• Git: Frequently Asked Questions
• Git: What's HEAD

• PowerShell: Create a Script
• PowerShell: File Name Extension
• PowerShell: Array
• PowerShell: Filter Array (Where-Object)

• JS: ECMAScript 2015

massive updates and new articles

• PowerShell: Eval Variable, String, ScriptBlock
• PowerShell: Launch App
• PowerShell: Run as Admin
• PowerShell: Clear Command History

• PowerShell: Object Type, Properties, Methods
• PowerShell: Value Types
• PowerShell: Get Object Type
• PowerShell: Check Type
• PowerShell: Test Equality
• PowerShell: Test Order (Greater, Lesser)
• PowerShell: Test If Collection Contains a Value
• PowerShell: True, False (boolean)
• PowerShell: Boolean Operators

• PowerShell: Rename Files, to File Hash String 📜

• JS: String Constructor
• JS: Difference Between String() vs new String()

• JS: Test Equality
• JS: Test Array Equality
• JS: Test Equality of Array and Object by Content 📜

• Python: Operators
• Python: Assignment Operators
• Python: Bitwise Operators
• Python: List Methods
• Python: Boolean. True False
• Python: Boolean Operators
• Python: Test Equality
• Python: Test Order (Greater, Lesser)

updates and new

• JS: Array.from
• JS: Array.of
• JS: Array.isArray
• JS: Array-Like Object to Array
• JS: Apply Array Method to Array-Like Object

• JS: Prototype and Inheritance
• JS: Prototype Chain

• JS: Function Call, Apply, Bind
• JS: Reflect.apply
• JS: Function.prototype.apply
• JS: Function.prototype.call
• JS: Function.prototype.bind
• JS: Difference Between Reflect.apply vs Function.prototype.apply
• JS: Function.prototype.apply vs Function.prototype.call

• JS: Random Integer Range Function 📜
• JS: Random Array Element, Randomize Array 📜
• JS: Randomize Node Children 📜

updates and new

• JS: Prevent Adding Property
• JS: Object.preventExtensions
• JS: Reflect.preventExtensions
• JS: Object.isExtensible vs Reflect.isExtensible
• JS: Object.isExtensible
• JS: Reflect.isExtensible
• JS: Object.seal
• JS: Object.isSealed
• JS: Object.freeze
• JS: Object.isFrozen

• JS: Reflect.set
• JS: Object.getOwnPropertyNames
• JS: Object.getOwnPropertyDescriptors

• JS: class (keyword)
• JS: Class Expression
• JS: typeof Class
• JS: static (keyword)
• JS: Define a Class Without class

• JS: Random Integer Range Function 📜

• JS: Boolean Constructor
• JS: Date Constructor
• JS: String Escape Sequence
• JS: Map.prototype.entries

updates and new

• JS: Enumerable Property
• JS: Version History
• JS: Convert Object to Map 📜
• JS: Object.keys
• JS: Object.fromEntries (Iterable to Object)
• JS: Object.entries
• JS: Object.values
• JS: Object.prototype.propertyIsEnumerable
• JS: Object.defineProperty
• JS: Object.assign

• JS: Spread Operator (triple dots)

now creating a bunch of new articles about JavaScript/DOM What's the difference between. See: JavaScript in Depth

also, lots updates and new on JavaScript

• JS: Test Equality
• JS: Test Equality of Array and Object by Content 📜
• JS: Test Array Equality

• JS: Math Operators
• JS: Assignment Operators
• JS: Boolean. true false
• JS: Boolean Operators
• JS: Number Comparison Operators
• JavaScript Basics

• JS: NaN
• JS: Number.isNaN
• JS: isNaN
• JS: Object.is
• JS: Number.isFinite
• JS: undefined

• JS DOM: NodeList vs HTMLCollection
• JS DOM: textContent, innerHTML, innerText, nodeValue
• jQuery Selector vs DOM querySelectorAll

the worst programing language design, yet python write it as a feature Python: Function Argument Default Value Wrong

• Xah Talk Show 2022-08-27 Automatic Code Formatting: JavaScript Python PowerShell Golang Elisp WolframLang, Emacs Integration

• Code Fun: digits of base n
• Find Replace Multi-Pairs Feedback Loop Problem

updates and new

• Python: Map f to List
• Python: Iterator to List
• Python: Iterate Dictionary
• Python: Tuple
• Python: Sets, Union, Intersection

• JS: Timing, Benchmark Functions
• JS: Array Push vs Unshift, Speed Comparison
• JS: Array.prototype.concat

• PowerShell: Pretty Format PowerShell Code 📜
• PowerShell: Toggle Dark Theme 📜
• PowerShell: Rename Files, to File Hash String 📜
• PowerShell: Backup Files 📜
• PowerShell: Dir Size 📜

new and updates

• Python: Format Code

• Programing Style: Concrete vs Abstract Code

• HTML: Custom Tag (Custom Element)

• Python: List
• Python: List Methods
• Python: Generate List: range
• Python: List Comprehension

• Metrically Compatible Fonts
• CSS: Syntax
• CSS: Length Units
• CSS: How Large is a CSS Pixel?

• Web Design, Minimal Window Width
• Screen Size Comparison. DVD, iPhone, iPad, MacBook, Blu-ray (2011)
• JS DOM: Find Window Size
• JS DOM: Get User Agent, Cookie Enabled Status
• JS DOM: document.write

• Linux: wget (Download Web Page)

• PowerShell: Print

• Evil Apple

• JS: Object.prototype
• JS: Date.prototype
• JS: Array.prototype
• JS: Number.prototype
• JS: Function.prototype
• JS: Boolean.prototype
• JS: Set (class)
• JS: Symbol.prototype
• JS: String (class)
• JS: String.prototype
• JS: Set.prototype

• Rust in Perspective. Programing Language History. By Linus Walleij (2022)

• Reddit Greed: Login Popup Block Content (2016)

massive js dom update.

• JS: Array-Like Object
• JS: Array-Like Object to Array
• JS: Apply Array Method to Array-Like Object

• JS: Loop. for while do
• JS: for-in Loop 👎
• JS: for-of Loop

• JS: DOM Methods
• JS DOM: Get Element by ID, Name, Class etc
• JS: Get Current Script Element
• JS: How to Iterate/Loop HTML Elements
• JS DOM: List, Add, Remove Class Attribute

• JS DOM: Get Element Parent, Child, Sibling
• JS: Create/Clone Node/Element
• JS DOM: Insert, Remove, Replace Element
• JS: insert Adjacent Element
• JS: Insert After an Element

• JS DOM: Remove Element
• JS DOM: Remove All Children
• JS DOM: Change Element Content

• JS DOM: Node, Node Type, Element
• JS DOM: Node Type
• JS DOM: Node Name
• JS DOM: Node value
• JS DOM: textContent, innerHTML, innerText, nodeValue
• JS DOM: Live Object
• JS DOM: NodeList vs HTMLCollection
• JS DOM: Whitespace Nodes
• JS DOM: History of GetElementsByClassName

• JS DOM: Element Attribute Methods
• JS DOM: Remove Attribute
• JS DOM: Change CSS

• CSS Property Names in JavaScript

• JS: Function Call, Apply, Bind
• JS: Function.prototype.call
• JS: Function.prototype.apply
• JS: Function.prototype.bind

• JS DOM: Browser Window Object
• JS DOM: Load Order, defer, async, module
• JS: Deferred Loading JavaScript for Old Browser

• Windows Ad Spam

• Xah Lee on LBRY/Odysee

• Why Bash Sucks
• Why I Love Powershell
• PowerShell Complexity
• ancient writ. The Unix Pestilence: Shells

• Which Programing Language Has Best Documentation (2014)
• Which Programing Language is Easier to Learn (2019)
• Programing Language Documentation Styles (2015)

• Homotopy Type Theory

misc minor updates

• Git: Basics
• Git: Create Project
• Git: Clone a Project

• User Interface Design: Windows Dark Theme Problem
• Worst User Interface, the MSI Realtek Audio Console

• Command to Download YouTube Video

• Python: List

• PowerShell: Array
• PowerShell: Array Sub-Expression Operator, Collection to Array
• PowerShell: Array Methods

• xah talk show 2022-08-10. Unix cult (linux, suckless), a crime of computing industry. The Damages it has done

• xah talk show 2022-08-08 programing language design, walk directory, in python, golang, PowerShell, emacs lisp, WolframLang

major updates on PowerShell

• PowerShell: Download, Install
• PowerShell: Start PowerShell
• PowerShell: Name Completion
• PowerShell: Case Sensitivity
• Windows Console Keyboard Shortcuts
• Windows Terminal

• PowerShell: List Directories
• PowerShell: Create Directory
• PowerShell: Copy Directory
• PowerShell: Delete Directory
• PowerShell: List Empty Directories

• PowerShell: Print Version
• PowerShell: Get Current Script Path
• PowerShell: Array
• PowerShell: Array Sub-Expression Operator, Collection to Array
• PowerShell: Download Webpage, curl, wget

• PowerShell: Show Path Environment Variable
• PowerShell: Environment Variable

• new PowerShell: Eval Variable, String, ScriptBlock
• PowerShell: Show Fullpath, No Truncate Lines
• PowerShell: Single Quoted String
• PowerShell: Automatic Variables
• PowerShell: String Length
• PowerShell: Copy File
• PowerShell: Rename File
• PowerShell: Move File
• PowerShell: Regular Expression Operators

• HP-28S Calculator (1988)

• Evil Apple

updates

• Python: Source Code Encoding
• Python: Walk Directory, List Files
• Golang: Walk Directory, List Files
• Golang: Walk Dir (old) 👎

• kleisli category

• Fad, Fashion, and Cult, in Programing Industry

• rando notes. ripgrep

• Git: Archive. Zip Repo

• Fundamental Problems of Lisp, Syntax Irregularity

• ASCII Characters
• Unicode: Symbols for ASCII Control Characters ␀

• Unicode UTF8 History, by Rob Pike

massive updates and rewrite in past days.

• Binary / Hexadecimal Converter
• What is Binary Number
• Hexadecimal Notation

• Python: Quote String
• Python: String Escape Sequence
• Python: Regex
• Python: Unicode Escape Sequence

• Python 2: Unicode Tutorial
• Python: Regex Object and Methods

• Python Regex re.search
• Python Regex re.match
• Python Regex re.split
• Python Regex re.findall
• Python Regex re.finditer
• Python Regex re.sub
• Python Regex re.subn
• Python Regex re.escape

• CSS: Selector Tutorial
• CSS Selector Syntax
• CSS: Attribute Selectors
• CSS: Pseudo-Class Selectors
• CSS: Pseudo-Element Selectors

• HTML: the Root Element

• CSS: Basics
• Add CSS
• CSS: Syntax

• CSS: First Letter
• CSS: First Line

• CSS: What is a Letter in first-letter Pseudo-Element?

• CSS: Pseudo Element
• CSS: Pseudo Class
• CSS: ::before , ::after pseudo-elements

• repost. Why is Array Access Constant Time

• Firefox Logo History

• PowerShell: List Files by Date Time
• PowerShell: String Wildcards

• Wolfram: List Files (Walk Directory)

• Emoji: Hand Gestures 👍

• PowerShell: List Files by Wildcard Name Pattern
• PowerShell: Pipe
• PowerShell: Pipeline Commands
• PowerShell: Search Text in Files (grep)

updates

• 2022-07-24 golang. https://go.dev/doc/go1.16 ioutil package deprecated. moved to io and os packages (although iotuil is still kept to preserve backwards compatability, but is no longer reccomended to use). thanks to “triangle”.
• 2022-07-24 generics in golang go1.18 (released 2022-03-15) https://go.dev/doc/go1.18

• Golang: Print Version
• Golang: Version History Release Dates
• Golang: Get Script Path
• Golang: Package, Import
• Golang: Semicolon
• Golang: Format Source Code
• Golang: Read File
• Golang: Read First n Bytes of File
• Golang: Write to File

• Golang: Walk Directory, List Files

• Golang: Find Text in Directory (grep) 📜
• Golang: Regex Find Replace Text in Directory 📜
• Golang: Generate Sitemap 📜
• Golang: Validate Website Local Links 📜

• PowerShell: Prompt User for Input

• Google YouTube Hide Dislikes (2021-11)
• Google Propaganda via Free Font (2021)

• Can Neural Net Solve Math Problems?

• Unicode Search 🔎, now you can save search result by bookmarking the url, or share it
• Xah Unicode Blog
• Unicode: Reference Marks † ‡ ¶ § ☛ ⁂
• Unicode: Tacks, Turnstiles ⊣ ⊢ ⊥ ⊤ ⫪ ⫫
• Unicode: Typography Ornaments ☙ ❦ ❧
• Unicode: Punctuations • ✓ ™
• Unicode: Slash, Solidus / ⫽ ⫻
• Unicode: Whitespace Representation ⇥ ▷ ␣ ¶

• Windows: List of Great Software

Stephen Wolfram interview Bob Metcalfe

updates and new:

• JS DOM: Get URL (window.location)
• JS DOM: Update URL Query String

• PowerShell: Toggle Dark Theme 📜
• User Interface Design: Windows Dark Theme Problem
• CSS: Dark Theme
• CSS: Media Query

massive major updates

• Wolfram Language for Programers
• Wolfram: Print Version
• Wolfram: Comment
• Wolfram: Print
• Wolfram: Shell Tasks Tutorial
• Wolfram: Navigate Directory
• Wolfram: Date Time
• Wolfram: List Files (Walk Directory)
• Wolfram: File Path Functions

• Python: Quote String
• Python: Comment

• Linux: Basic Shell Commands
• Linux: Get System Info
• Linux: Command Help, Man Page
• Linux: Search/Find Command
• Linux: Manage Processes, ps, kill
• Linux: Navigate Directory
• Linux: List Files
• Linux: Show File Content
• Linux: Disk Size

• PowerShell: Download, Install
• PowerShell: Print Version
• PowerShell: Find Command
• PowerShell: List of Aliases
• PowerShell: List Files
• PowerShell: List Files by Wildcard Name Pattern
• PowerShell: List Files by Date Time

updated today. lots work in past days on my JavaScript tutorial and PowerShell.

• PowerShell: Single Quoted String
• PowerShell: String Length
• PowerShell: Write to File
• PowerShell: Print
• PowerShell: List Files
• PowerShell: List Files by Wildcard Name Pattern
• PowerShell: Rename Files, to File Hash String 📜
• PowerShell Launch File Explorer with Selection

• JS: Determine Type of Object
• JS: Object.prototype.toString
• JS: null
• JS: Array-Like Object
• JS: Array-Like Object to Array

• JS: Get Set Property
• JS: Reflect.set
• JS: Create Property
• JS: Object.defineProperty
• JS: Reflect.deleteProperty
• JS: Reflect.getOwnPropertyDescriptor
• JS: Object.getOwnPropertyDescriptors

• JS: Interface
• JS: Iterable
• JS: Generator Function

• JS: this (binding)
• JS: Strict Mode

• JS: Object Overview
• JS: Create Object
• JS: Object Literal Expression
• JS: Prototype and Inheritance
• JS: Get Set Prototype
• JS: Object.prototype.__proto__
• JS: Object Type

• JS: Property Overview
• JS: Property Key
• JS: Getter Setter Properties

• JS: Symbol Tutorial

• JS: Quote String
• JS: Operators
• JS: in (operator) 👎
• JS: Optional Chaining Operator

• JS: Reflect.get
• JS: Reflect.has

• JS: undefined

• Comp Lang: is the Map Function Functional Programing in Syntax or Semantics

• JS: Test Equality of Array and Object by Content 📜
• JS: Test Array Equality

programing language documentation problem. What is a reference? Java JavaScript

• here's a interesting documentation problem.
• note that, afaik, the concept of “reference” is not mentioned in js spec.
• (maybe it is. i forgot. but not in a way for programer, only to compiler writer)
• so u have this problem. How do u explain, the fact that array can be assigned to a constant and still can change.
• if u mention “reference”, then u need to explain it.
• but in order to explain “reference”, you have to mention implementation and hardware, such as memory address.
• but these things, are irrelevant to JS the language.
• The solution, seems to be, to add a concept of “reference” to the language, by saying it's just some kinda object ID. Python does this with object ID, and Java does this with an actual value type, the Reference Type.

• Doc by Dummies

• JS: Timing, Benchmark Functions
• JS: Range Function for Array 📜

old blog, updated, or on its own page

• Stackoverflow JavaScript Millennials on Compiler (2014)
• The Overflow of StackOverflow (2014)
• StackOverflow Email Spam (2019)
• Disqus AD Spam (2017)
• Google Plus Now Ghost Town (2017)

• Ruby Conf 2016 SJW on Eric S Raymond
• Hacker Archetypes, Eric S Raymond
• Eric S Raymond wrote: How not to engage me!

• Semantics and Symbols: Examples of Unicode Symbols Usage

• Wolfram Language Speed Guide
• Wolfram: List. Delete Element

• compatibility for popularity

• Problem of the Big O Notation for Leetcode

more work on WolframLang tutorial for programers. This is a functional form for generating a list, similar to python's list comprehension Wolfram: List. Create (Table)

• Wolfram: List. Get Parts
• Wolfram: List. Position
• Wolfram: List. Join, Union, Intersection, Difference

• Why Python Doc Sucks

• Wolfram: File Name Extension

• Software Freedom is Free Speech or Free Beer (2010)

lots major update and rewrite

• What is Closure in Programing Language
• JS: Closure
• Golang: Closure
• Python: Closure
• Python: Closure in Python 2

updates

• HTML: Syntax Basics
• HTML: List: ul ol li
• HTML: Nested List
• Markdown Tutorial

• Lambda in Python 3000

• Wolfram: If Then Else (Conditionals, Branching)
• Wolfram: Which, Switch

• Concepts and Confusions of Prefix, Infix, Postfix and Lisp Notations
• How Purely Nested Notation Limits the Language's Utility

• Wolfram: Define Function by Pattern
• Wolfram: Set, SetDelayed
• Wolfram: Pattern Matching
• Wolfram: Pattern Syntax

• xah talk show 2022-06-24 elements of programing language: emacs lisp, WolframLang, python, JavaScript, golang, PowerShell

• omg, martin fowler, i consider him the biggest crackpot in computing
• him, and larry wall. are the biggest crackpot snakeoil seller
• but larry wall subsided.

• Why Are Hackers Obssessed on DSL, Domain Specific Language

• Wolfram: Function major expansion

• Code Fun: Partition a List by Equivalence

• Linux: rsync Tutorial
• Unison Tutorial (Sync Files)

• New York Times ASCII Art

• Zoomer Gen Python Programers are Dummies

in Ubuntu Linux, as of 2013-11-25, there's a bug that pydoc modules will crash Python. Use python3 instead. sudo apt-get install python3.

much more work on Python. Learn Python in a day.

• Xah Python Tutorial Search 🔍
• Python: Source Code Encoding
• Python: Convert Int, Float, String

• Why Python Sucks
• Why is Python Popular

• Python: Quote String
• Python: String Escape Sequence
• Python: Unicode 🐍
• Python: Unicode Escape Sequence

• Wolfram: Expression
• Wolfram: Source Code Encoding and Unicode
• Wolfram: File Encoding

lots update and new pages. re-org nav bar.

• PowerShell: Define Function
• PowerShell: Empty Trash
• PowerShell: Path parameter
• PowerShell: Path Operations
• PowerShell: Date Time

• Navigational Panel Design

updates

• JavaScript Basics
• JS: Boolean. true false
• JS: Test Equality
• JS: Quote String
• JS: String Overview

• Pirated O'Reilly Books, year 2011

now golang tutorial has grouping in nav bar.

• Golang Overview
• Golang Tutorial
• Golang: String Backslash Escape

massive update

• Wolfram: Arithmetic Basics
• Wolfram: Force Numerical Result
• Wolfram: True, False (boolean)
• Wolfram: Equality Test
• Wolfram: Number Comparison
• Wolfram: If Then Else (Conditionals, Branching)

• Wolfram: Function
• Wolfram: Define Function by Pattern

• Wolfram: CompoundExpression and Semicolon
• Wolfram: Variable
• Wolfram: Local Variable

• Wolfram: List
• Wolfram: Nested List, Array, Tree, Dimensions
• Wolfram: Expression

• Windows: Delete Lockscreen Background Image

• Who Invented Hello World?

• Deno: Intro

• PowerShell: Array
• PowerShell: Iterate Array
• PowerShell: Pretty Format PowerShell Code 📜

• CSS: Atomic Style

major update

• Python Tutorial
• Perl Tutorial

• updated. nested function PowerShell: Define Function
• PowerShell: Profile (init file)

perl in WolframLang style

supreme. Perl: Delete Duplicate Image Files

Perl in wolframlang style. Year 2003. Notable are the functions: combo, reduce, merge, genpair. (not what you think) and using nested list the way you'll not find in industrial code.

Lol, look at this one liner Mathematica style

• used to piss the perlers, and plus, they no understand it.
• overly complex. even i no unstand it now. lol
• not complex in a dumb way. but complex in the sense it follows a 'elegant' and very functional programing and using nested list extensively.
• and follows a strange one-liner style.

• xah talk show 2022-06-09 PowerShell rename file in a dir to hash
• Perl Tutorial
• Perl: Delete Duplicate Image Files

Been using dark theme for 5 months now. Conclusion: light theme is actually easier on the eye.

But one particular interesting thing is, bold word are less perceptible when its white text on black. Example: Code where variables are bold, when in dark theme, it's hard to tell if they are bold at all. Similar for for headings with larger font size, such as html h2, h3 headings.

• PowerShell: Toggle Dark Theme 📜
• CSS: Dark Theme
• User Interface Design: Windows Dark Theme Problem

• new PowerShell: Dir Size 📜

order hash table in tutorial in this order

• map, hashtable, dictionary, association list, in
• Elisp: Hash Table
• JS: Map Tutorial
• Python: Dictionary
• Perl: Hash Table
• Ruby: Hash Table

• Wolfram: Association (Key Value List)

major updates, lots refinement and new pages. Wolfram Language Tutorial