Is ES3 good enough? Was incrementally strengthening ES3 paradigms considered?

P T Withington ptw at
Wed Nov 14 08:53:20 PST 2007

On 2007-11-14, at 00:14 EST, Yuh-Ruey Chen wrote:

> Oh come on :) I was referring to the syntax of the class system, which
> is undoubtedly Java-esque. Lot of Java haters in the functional (no
> 1st-class functions!) and scripting (too verbose!) programming crowd.
> Pretty much everyone's first impression of the class system in ES4 is
> that Java is being merged into the language. Kinda like how everyone
> thinks that Java inherited its type system from C++ instead of  
> Modula-3.

A key difference from Java is that types are optional.  There is not  
enough experience with es4 yet to know, but in other type-optional  
languages I have worked with, I did not have a Java-esque feeling of  
verbosity.  Perhaps this is because I was coming from a dynamically- 
typed background, so I did not have the reaction that given types I  
had to declare them everywhere.  Someone coming from a statically- 
typed background might just continue their old habits and never  
discover the freedom and power of leaving out unnecessary declarations.

In my experience with Dylan, it worked best to only specify types to  
enforce contracts and to dispatch generic functions.  In particular,  
you almost never declared the types of local variables, the compiler  
would work that out for you.  Ideally, a type-inferencing compiler  
should be able to warn you when the lack of a type declaration will  
cause a run-time type check (safety warning) or run-time dispatch  
(performance warning). 

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