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(cont), infix ∋
Combined from primary sources listed below.

In Operators§

See primary documentation in context for infix (cont), infix ∋ 

multi infix:<(cont)>($a,$b --> Bool:D)

Membership operator.

Returns True if $a contains $b as an element.

say (1,2,3) (cont) 2; # OUTPUT: «True␤» 
say (1, 2, 3) ∋ 4;    # OUTPUT: «False␤» 

Since release 2020.05, ∍ is an alias for this operator.

In Sets, bags, and mixes§

See primary documentation in context for infix (cont), infix ∋

Returns True if $a contains $b as an element, else False. More information, Wikipedia definition.