X-DIFF
[GENERIC-FUNCTION]
OM 6.1
Function Reference
| - l1? | a list | ||
| - l2? | a list | ||
|
&optional |
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| - test | test function | [default = equal] | |
| - key | test key | [default = identity] | |
|
&rest |
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| - list | more lists | ||
Description:
Returns the list of elements present in <l1?> but not in <l2?>.
<test> is a function or function name for a binary comparison.
<key> is a name or function name to apply to the elements before comparison.
Ex. (x-diff '(1 2 3 4 5) '(4 5 6 7 8)) => (1 2 3)