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What are the different varieties of LISP and what are the most significant differences between them?
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There are two other types of lisp: the lateral lisp, and the palatal lisp. In a lateral lisp the person produces the 's' and 'z' sounds with the air escaping over the sides of the tongue, while in a palatal lisp they attempt to make the sounds with the tongue in contact with the palate.
Lisp Type #4: Dentalized Lisp If a person has a dentalized lisp, the person's tongue directs airflow forward by pushing against their front teeth. It may produce a “muffled” sound. A lisp may become visible when a child is around 2-years old.
An interdental (frontal) lisp occurs when the tongue sticks out between the front teeth. This error makes /s/ and /z/ sound like “th” (e.g., yeth/yes). A lateral lisp occurs when air escapes over the sides of the tongue. A lateral lisp often sounds “wet” or “slushy” because you can hear the sounds of saliva.
The most popular dialects today are: Common Lisp, Scheme, and Clojure
The Clojure website has a page comparing and contrasting all three. Lisp diehards tend to prefer CL or Scheme. Clojure is the "hot new thing" and is a hybridization of Lisp and Java.
Common Lisp and Scheme both have a large number of implementations to pick from. Clojure has two: one for the JVM and one for the CLR.
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