[racket] Signature for an optional-argument function?

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Aug 23 19:37:48 EDT 2013

On Aug 23, 2013, at 4:17 PM, Alexander D. Knauth wrote:

> how different is Racket from ISL?  How hard would it be for me to learn Racket if I only know ISL and only started programming this summer?  

The *SL languages are designed as a gradual ramp-up to Racket though the two look a bit out of sync on occasion. 

The next step is Realm of Racket. And it's well within your reach, including a teaser chapter. 

-- Matthias

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