When comparing JSFiddle vs JavaScript: The Good Parts, the Slant community recommends JavaScript: The Good Parts for most people. In the question“What are the best resources to learn JavaScript?” JavaScript: The Good Parts is ranked 6th while JSFiddle is ranked 17th. The most important reason people chose JavaScript: The Good Parts is:
JS can be a confusing language and often provides difficulty writing good code that uses objects and methods. Crockford explains why that is and how to think about the language to avoid confusion.
Specs
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Pros
Pro CoffeeScript and SCSS support
In addition to supporting JavaScript and CSS, language settings can be switched to CoffeeScript and SCSS.
Pro Allows collaborating on code
JSFiddle makes it easy to save the code snippets and send the link to others who can view and edit the code.
Pro Supports a wide variety of frameworks and extensions
JSFiddle can switch to selection of frameworks and extensions including jQuery, AngularJS, ReactiveJS, D3 simply from a dropdown.
Pro Explains what makes JS confusing and how to go about it
JS can be a confusing language and often provides difficulty writing good code that uses objects and methods. Crockford explains why that is and how to think about the language to avoid confusion.
Pro Good for intermediate programmers
The book requires basic understating of how programming works and even some understanding of JavaScript itself.
Cons
Con Not actually an IDE
JSFiddle is not actually an IDE and is only suitable for small blocks of code.
Con Non free/libre (proprietary)
Con Lack of consistency
Where some parts of the book cover very basic concepts, other parts expect at least an intermediate understanding on JavaScript. There is a lack of consistency, causing some confusion as to who the book is aimed at.