common, diff

Synopsis:
$common (<word list> / <word list>)
$diff (<word list> / <word list>)

Technical:
These functions are exact opposites. The $common( ) function finds and returns all words common to both input lists. The $diff( ) function finds and returns all words present in only one list. The two input lists must be separated by a single forward-slash. Whitespace is not significant.

Practical:
These functions might be considered useful for statistical information. For instance, given 2 channels, they could be used to show who is and isn't on both of them.

Returns:
common: words in both lists diff: words not in both lists

Examples:
$common(one two three / two three four) returns "two three"
$common(one two / three four) returns "" (empty string)
$diff(one two three / two three four) returns "one four"
$diff(one two / one two) returns "" (empty string)

See Also:
remws
uniq

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