是否有与car，cdr和cons等价的红宝石? [英] Are there ruby equivalents to car, cdr, and cons?

问题描述

是否有与lisp car，cdr和cons功能相当的红宝石功能?对于那些不熟悉Lisp的人，这是我想要的红宝石:

Are there ruby equivalents to the lisp car, cdr, and cons functions? For those unfamiliar with lisp, here's what I want from ruby:

[1,2,3].car   => 1
[1,2,3].cdr   => [2,3]
[2,3].cons(1) => [1,2,3]

(以Lisp表示):

(car '(1 2 3))  => 1
(cdr '(1 2 3))  => (2 3)
(cons 1 '(2 3)) => (1 2 3)

推荐答案

Ruby数组未实现为单链接列表，因此，拥有car，cdr和东西并不是那么有用.

Ruby arrays are not implemented as singly-linked lists, so it is not as useful to have car and cdr and stuff.

如果您真的想要，可以做

If you really wanted, you could do

[1,2,3][0]      => 1
[1,2,3].first   => 1
[1,2,3][1..-1]  => [2,3]
[1] + [2,3]     => [1,2,3]

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