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--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Flattens <em>self</em> in place. Returns <tt>nil</tt> if no modifications were made (i.e., <em>array</em> contains no subarrays.) If the optional <em>level</em> argument determines the level of recursion to flatten.
- !ruby/struct:SM::Flow::VERB 
  body: "   a = [ 1, 2, [3, [4, 5] ] ]\n   a.flatten!   #=&gt; [1, 2, 3, 4, 5]\n   a.flatten!   #=&gt; nil\n   a            #=&gt; [1, 2, 3, 4, 5]\n   a = [ 1, 2, [3, [4, 5] ] ]\n   a.flatten!(1) #=&gt; [1, 2, 3, [4, 5]]\n"
full_name: Array#flatten!
is_singleton: false
name: flatten!
params: |
  array.flatten! -> array or nil
  array.flatten!(level) -> array or nil

visibility: public