End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Set#<<

<<(o)

# File tmp/rubies/ruby-3.2.0/lib/set.rb, line 521
def add(o)
  @hash[o] = true
  self
end

Alias of #add

Adds the given object to the set and returns self. Use merge to add many elements at once.

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)                    #=> #<Set: {1, 2}>

See also #add #< #<= #- also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0

‹ prev#< next ›#<=