infix ∉

Documentation for infix assembled from the following types:

language documentation Sets, bags, and mixes

From Sets, bags, and mixes

(Sets, bags, and mixes) infix ∉

Returns True if $a is not an element of $b, else False. More information, Wikipedia definition.

language documentation Operators

From Operators

(Operators) infix ∉

multi sub infix:<>($a,$b --> Bool:D)

Non-membership operator.

Returns True if $a is not an element of $b. Equivalent to !(elem).

say 4  (123);       # OUTPUT: «True␤» 
say 2 !(elem) (123); # OUTPUT: «False␤» 

is codepoint U+2209 (NOT AN ELEMENT OF).