Interpreter
The interpreter pattern is an interesting pattern as it allows for the creation of your own language. This might sound like something of a crazy idea, we're already writing JavaScript, why would we want to create a new language? Since the publication of the GoF book Domain specific languages (DSLs) have had something of a renaissance. There are situations where it is quite useful to create a language that is specific to one requirement. For instance the Structured Query Language (SQL) is very good at describing the querying of relational databases. Equally, regular expressions have proven themselves to be highly effective for the parsing and manipulation of text.
There are many scenarios in which being able to create a simple language ...
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