Applejack's Hat

The '''Applejack's Hat''' scenario is one that was used to work out how variables should work in FiM++ when it was first being proposed. This particular phrase was used because it represents several decisions about how the language, as a whole, should work.

== Challenges ==
* "{{code|variable|Applejack's Hat}}" must be used as a variable name, as it is mundane enough that users of the language will expect it to be valid
* It contains [[whitespace]], something most other programming languages prohibit in keywords.
* It contains both lower- and upper-case letters.
* It contains an apostrophe

=== Resolutions ===
The following were changes made to the language to accommodate for Applejack's hat. These affect how character literals are defined, what is valid punctuation, and what is a valid variable, class, and paragraph name.

* Names may contain any UTF-8 character that does not conflict with other restrictions
* Names may contain any whitespace character, and variable declaration ends when a [[keyword]] or [[punctuation]] is encountered
* Names are case-sensitive
* Names may contain [[operators]] and [[literals]] as long as they are ''after'' the first character of the word.

== Other similar propositional variable names ==
=== Valid names ===
These were also used as examples for what must be a valid variable name:
* {{code|class|how to add all the Numbers from 1 to 100}}
** Contains an alternate capitalization of the "{{code|type|the numbers}}" reserved keyword, as well as two number literals
* {{code|variable|Somepony’s true identity}}
** Contains an apostrophe and a Boolean literal
* {{code|variable|Team Fortress 2}}
** Contains a number literal

=== Invalid Names ===
These were used as examples for what might seem like valid variable names, but are not.
* {{code|variable|Twilight's favorite {{codeerror|number}}}}
** Contains a reserved keyword phrase
* {{code|paragraph|{{codeerror|99}} Jugs of Cider}}
** Contains a literal at the beginning

== See Also ==
* [[99 Jugs of Cider]]