Lisp Append 无法正常工作 [英] Lisp Append Not Working Properly
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问题描述
Hi I am trying append a simple element to a lisp list.
(append queue1 (pop stack1))
I thought the above code would append the first element of stack1 to queue1. Does queue1 need to be non nil? Thanks.
解决方案
Append returns the concatenated list (queue1 with the first element of stack1 appended). It does not modify queue1.
The destructive equivalent of append is nconc: this appends to the list "in place."
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