# infix (|), infix ∪

Documentation for infix `(|), infix ∪`

assembled from the following types:

# language documentation Sets, bags, and mixes

## (Sets, bags, and mixes) infix (|), infix ∪

Returns the **union** of all its arguments. More information, Wikipedia definition.

# language documentation Operators

From Operators

## (Operators) infix (|), infix ∪

multi sub infix:<(|)>(**)

'|' as in left hand side arguments 'or' right hand side arguments.

Returns the **union** of all of its arguments. This creates a new Set that contains all the elements its arguments contain if none of the arguments are a Bag, BagHash, Mix or MixHash.

say <a b d> ∪ bag(<a a b c>); # OUTPUT: «Bag(a(2) b c d)»

If any of the arguments are Baggy or Mixy, the result is a new `Bag`

(or `Mix`

) containing all the elements, each weighted by the *highest* weight that appeared for that element.

say <a b d> ∪ bag(<a a b c>); # OUTPUT: «Bag(a(2) b c d)»