I'll hold my hands up and say I did have a knee-jerk reaction to the criticism but then I remembered when I started learning Lisp.
I did often wonder where the arrays, hashmaps and other data structures were. I remember I had my own practice problems that involved random access so a vector would have been more efficient than a list.
In fairness, I think you either will be far enough on your travels with other languages to intuit that Lisp implementations do have these primitives ("surely not? Ah, lo and behold, racket has a nice vector interface. Not sure about CL's hashmap interface..." and so on) or you will be so far on your travels with lisp to understand why you need this that you already know.
I don't think I would direct a complete beginner to programmer to this page.
I did often wonder where the arrays, hashmaps and other data structures were. I remember I had my own practice problems that involved random access so a vector would have been more efficient than a list.
In fairness, I think you either will be far enough on your travels with other languages to intuit that Lisp implementations do have these primitives ("surely not? Ah, lo and behold, racket has a nice vector interface. Not sure about CL's hashmap interface..." and so on) or you will be so far on your travels with lisp to understand why you need this that you already know.
I don't think I would direct a complete beginner to programmer to this page.