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JavaScript: The Esoteric Parts

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# JavaScript: The Esoteric Parts

## Table of Contents

- Introduction
- Classical vs. Prototypal inheritance
- Psudoclassical Inheritance
- Object Composition
- The ES6 `class`
- Semicolons
- *Tabs vs Spaces*
- Semantic Versioning
- Arrow function syntax
- Observer Patterns
- Constants and Immutability
- *Frameworks vs. Vanilla*
- [Contribution Guidelines](#contribution-guidelines)
- [License](#license)

## Introduction

## Classical vs. Prototypal inheritance

JavaScript uses prototypal inheritance instead of classical inheritance.  Knowing the difference is key to understanding the discussions below.

- [Classical Inheritance in JavaScript](http://www.crockford.com/javascript/inheritance.html)
- [Why Prototypal Inheritance Matters](http://aaditmshah.github.io/why-prototypal-inheritance-matters/)
- [Benefits of prototypal inheritance over classical?](http://stackoverflow.com/questions/2800964/benefits-of-prototypal-inheritance-over-classical)

## Psudoclassical Inheritance (The `new` and `this` keywords)

Controversy over how to do class-like inheritance in JavaScript existed long before the ES6 `class` keyword.

- [Crockford on JavaScript](https://www.youtube.com/watch?v=ya4UHuXNygM&t=50m23s)

## Object Composition

- [Composition over Inheritance](https://medium.com/humans-create-software/composition-over-inheritance-cb6f88070205) by Mattias Petter Johansson
  - [comment](https://www.reddit.com/r/programming/comments/3m64ns/composition_over_inheritance/cvccr2u)
- [The Open Minded Explorer’s Guide to Object Composition](https://medium.com/javascript-scene/the-open-minded-explorer-s-guide-to-object-composition-88fe68961bed) by Eric Elliott
  - [comment](https://medium.com/@jeffm712/every-industry-has-its-own-jargon-words-that-have-special-and-technical-meaning-beyond-what-you-1cc05d519ff9) by Jeff M
    - [Composition vs Composite Pattern](https://medium.com/@_ericelliott/composition-vs-composite-pattern-842133706472) by Eric Elliott
      - [comment](https://medium.com/@jeffm712/nope-the-definition-i-m-referring-to-is-indeed-for-composition-707e4499e85a) by  Jeff M

## The ES6 `class`

ES6 introduced the `class` keyword.  ES6 classes are syntactical sugar over prototypal inheritance.  There are many arguments for and against the `class` keyword in JavaScript.

- [How to Fix the ES6 `class` keyword](https://medium.com/javascript-scene/how-to-fix-the-es6-class-keyword-2d42bb3f4caf) by Eric Elliott
- [The Two Pillars of JavaScript](https://medium.com/javascript-scene/the-two-pillars-of-javascript-ee6f3281e7f3) by Eric Elliott
  - [Crockford's Wager](https://medium.com/@hypercubed/ok-let-me-play-devils-advocate-for-a-second-and-introduce-crockford-s-wager-f8e051cc52a) comment by Jayson Harshbarger
- [A Simple Challenge to
Classical Inheritance Fans](https://medium.com/javascript-scene/a-simple-challenge-to-classical-inheritance-fans-e78c2cf5eead)  by Eric Elliott
  - [comment](https://medium.com/@rauschma/i-would-never-argue-that-es6-classes-are-clearly-a-better-choice-than-composition-modules-or-891e462da85b) by Axel Rauschmayer
- [Not Awesome: ES6 Classes](https://github.com/joshburgess/not-awesome-es6-classes) by joshburgess
  - [comment](https://www.reddit.com/r/javascript/comments/3nkycz/not_awesome_es6_classes_a_curated_list_of/) by rauschma
- [How to Use Classes and Sleep at Night](https://medium.com/@dan_abramov/how-to-use-classes-and-sleep-at-night-9af8de78ccb4) by Dan Abramov
- [ES6 class](https://github.com/getify/You-Dont-Know-JS/blob/master/this%20&%20object%20prototypes/apA.md) by getify

## Semicolons

JavaScript has a feature called Automatic semicolon insertion (ASI).  With ASI, you are able to omit certain semicolons.  Use of this feature is controversial.  After the `class` keyword, ASI may be JavaScript's most controversial syntactic feature.

- [An Open Letter to JavaScript Leaders Regarding Semicolons](http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding) by Isaac Z. Schlueter
- [JavaScript Semicolon Insertion, Everything you need to know](http://inimino.org/~inimino/blog/javascript_semicolons)
- [Understanding automatic semi-colon insertion in JavaScript](http://jamesallardice.com/understanding-automatic-semi-colon-insertion-in-javascript/)
- [Well, actually; Not all semicolons…](http://blog.getify.com/not-all-semicolons/) by getify

## Semantic Versioning

Semantic Versioning, while not a feature of JavaScript, is vital to JavaScript package management and is often misunderstood.

- [We fail to follow SemVer – and why it needn’t matter](https://www.youtube.com/watch?v=tc2UgG5L7WM&index=6&list=PLFZ5NyC0xHDaaTy6tY9p0C0jd_rRRl5Zm) by Stephan Bönnemann at JSConf Budapest 2015
- [Semantic Versioning: Why You Should Be Using it](http://www.sitepoint.com/semantic-versioning-why-you-should-using/)
- [Pragmatic Semantic Versioning](http://ponyfoo.com/articles/semver) by Nicolas Bevacqua
- [Why semver ranges are literally the worst…](https://medium.com/@kentcdodds/why-semver-ranges-are-literally-the-worst-817cdcb09277) by Kent C. Dodds

## Arrow function syntax

- [Arrow This](http://blog.getify.com/arrow-this/) by getify

## Observer Patterns

- [Comparison between different Observer Pattern implementations](https://github.com/millermedeiros/js-signals/wiki/Comparison-between-different-Observer-Pattern-implementations)

## Constants and Immutability

- [Constantly Confusing ‘const’](http://blog.getify.com/constantly-confusing-const/) by getify

# Contribution Guidelines

Please read the following guidelines:

- Search previous suggestions before making a new one, as yours may be a duplicate.
- Make an individual pull request for each suggestion.
- Titles should be [capitalized](http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html).
- Use the following format: `[Content Title](content link)` and `by Author Name` where appropriate.
- Choose corresponding section (and subsection) for your suggestion. 
- New sections (and subsection) are welcome.
- Try to keep this resource objective but feel free to link to your subjective resource.
- Try to link to primary sources instead of collections.

## License

[![Creative Commons License](http://i.creativecommons.org/l/by/4.0/88x31.png)](http://creativecommons.org/licenses/by/4.0/)

This work is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by/4.0/).

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