Set#add?

add?(o)

# File tmp/rubies/ruby-3.3.0/lib/set.rb, line 523
def add?(o)
  add(o) unless include?(o)
end

Adds the given object to the set and returns self. If the object is already in the set, returns nil.

Example

Set[1, 2].add?(3)                    #=> #<Set: {1, 2, 3}>
Set[1, 2].add?([3, 4])               #=> #<Set: {1, 2, [3, 4]}>
Set[1, 2].add?(2)                    #=> nil

See also #add #as_json #| #classify also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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