[racket] Value Extraction from Lists vs. Structures

From: Luke Jordan (luke.jordan at gmail.com)
Date: Mon Dec 6 23:42:44 EST 2010

I'm reading HtDP 29.3.

I get how value extraction from lists works in O(n) time, but how does
extraction from structures work in O(1)?

Thanks (for being the "help me with HtDP" mailing list as well as the Racket
mailing list...)

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