Update various parts of the text.

There's no such thing as "early ReferenceError" anymore (for things like 0++); they're all just "early SyntaxError" now. tc39/ecma262#691

Of the three examples here only hash correctly reports if an executable is in the PATH. type -p and command -v both report success on aliases, builtins, etc.

type -P (capital P) does correctly report if an executable is in the PATH.

Perhaps this section could

It says that python gets left to point to the system python (2.7 on OSX), but then goes on to say that python points to homebrew Python3.

https://github.com/realpython/python-guide/blame/master/docs/starting/install/osx.rst#L84-L89

Not sure which bit needs to be changed.

explanation behind that says it's just coercion of one type plus another.
What is happening there is actually a code block and a unary + which coerces the array into 0.
({} + []) would get the same as ([] + {}) understandably.

States we need set the current architecture to i386 but the command run afterwards sets it to i8086

Is this intentional or a typo?

Right now it's just a collection of links (the basic format of each entry is 'name - author'). It might be helpful to make room for 1-2 sentence explanations of the link, particularly as the list grows.

(PS this project is linked prominently from the website now)

Recently, I opened rust-lang/reference#763, which is in the wrong place because the reference should not be a guide. This book, however, should serve as a guide.

I personally found the reference explanation to be a better material to learn about how to use Macros by example rather than the current chapter on Macros the book has (which was a bit confusing, as if it trie

I think it would be valuable to explicitly talk about whitespace requirements in [ ] and [[ ]] conditionals--this tripped me up when learning Bash and I know it's a pain point for a lot of developers.

The way I like to think about it is that [ and [[ are commands/builtins (like echo, etc), as opposed to being part of Bash syntax. For this reason, the command name and each of its argumen