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combination-i.ri
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U:RDoc::AnyMethod[iI"combination:ETI"Array#combination;TF: privateo:RDoc::Markup::Document: @parts[o: RDoc::Markup::Paragraph; [I"ICalls the block, if given, with combinations of elements of +self+; ;TI"@returns +self+. The order of combinations is indeterminate.;To: RDoc::Markup::BlankLine o; ; [I"_When a block and an in-range positive \Integer argument +n+ (<tt>0 < n <= self.size</tt>) ;TI"Jare given, calls the block with all +n+-tuple combinations of +self+.;T@o; ; [I" Example:;To:RDoc::Markup::Verbatim; [I"a = [0, 1, 2] ;TI"5a.combination(2) {|combination| p combination } ;T: @format0o; ; [I" Output:;To; ; [I" [0, 1] ;TI" [0, 2] ;TI" [1, 2] ;T; 0o; ; [I"Another example:;To; ; [I"a = [0, 1, 2] ;TI"5a.combination(3) {|combination| p combination } ;T; 0o; ; [I" Output:;To; ; [I"[0, 1, 2] ;T; 0o; ; [I"DWhen +n+ is zero, calls the block once with a new empty \Array:;To; ; [I"a = [0, 1, 2] ;TI":a1 = a.combination(0) {|combination| p combination } ;T; 0o; ; [I" Output:;To; ; [I"[] ;T; 0o; ; [I"LWhen +n+ is out of range (negative or larger than <tt>self.size</tt>), ;TI" does not call the block:;To; ; [I"a = [0, 1, 2] ;TI"=a.combination(-1) {|combination| fail 'Cannot happen' } ;TI"<a.combination(4) {|combination| fail 'Cannot happen' } ;T; 0o; ; [I"1Returns a new \Enumerator if no block given:;To; ; [I"a = [0, 1, 2] ;TI"Ba.combination(2) # => #<Enumerator: [0, 1, 2]:combination(2)>;T; 0: @fileI" array.c;T:0@omit_headings_from_table_of_contents_below0I"Zarray.combination(n) {|element| ... } -> self array.combination(n) -> new_enumerator ;T0[ I" (p1);T@MFI" Array;TcRDoc::NormalClass00