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U:RDoc::AnyMethod[iI"[]:ETI"
Array#[];TF: publico:RDoc::Markup::Document: @parts[4o: RDoc::Markup::Paragraph; [I":Returns elements from +self+; does not modify +self+.;To: RDoc::Markup::BlankLine o;
; [I"In brief:;T@o:RDoc::Markup::Verbatim; [I"a = [:foo, 'bar', 2]
;TI"
;TI"3# Single argument index: returns one element.
;TI"5a[0] # => :foo # Zero-based index.
;TI"Ma[-1] # => 2 # Negative index counts backwards from end.
;TI"
;TI"5# Arguments start and length: returns an array.
;TI" a[1, 2] # => ["bar", 2]
;TI"Ma[-2, 2] # => ["bar", 2] # Negative start counts backwards from end.
;TI"
;TI"0# Single argument range: returns an array.
;TI"!a[0..1] # => [:foo, "bar"]
;TI"Sa[0..-2] # => [:foo, "bar"] # Negative range-begin counts backwards from end.
;TI"Qa[-2..2] # => ["bar", 2] # Negative range-end counts backwards from end.
;T: @format0o;
; [I"\When a single integer argument +index+ is given, returns the element at offset +index+:;T@o; ; [ I"a = [:foo, 'bar', 2]
;TI"a[0] # => :foo
;TI"a[2] # => 2
;TI" a # => [:foo, "bar", 2]
;T;
0o;
; [I"EIf +index+ is negative, counts backwards from the end of +self+:;T@o; ; [I"a = [:foo, 'bar', 2]
;TI"a[-1] # => 2
;TI"a[-2] # => "bar"
;T;
0o;
; [I"/If +index+ is out of range, returns +nil+.;T@o;
; [I"@When two Integer arguments +start+ and +length+ are given, ;TI"greturns a new +Array+ of size +length+ containing successive elements beginning at offset +start+:;T@o; ; [I"a = [:foo, 'bar', 2]
;TI" a[0, 2] # => [:foo, "bar"]
;TI" a[1, 2] # => ["bar", 2]
;T;
0o;
; [I"FIf start + length is greater than self.length, ;TI"9returns all elements from offset +start+ to the end:;T@o; ; [ I"a = [:foo, 'bar', 2]
;TI"#a[0, 4] # => [:foo, "bar", 2]
;TI" a[1, 3] # => ["bar", 2]
;TI"a[2, 2] # => [2]
;T;
0o;
; [I">If start == self.size and length >= 0, ;TI"!returns a new empty +Array+.;T@o;
; [I",If +length+ is negative, returns +nil+.;T@o;
; [I"4When a single Range argument +range+ is given, ;TI"0treats range.min as +start+ above ;TI"/and range.size as +length+ above:;T@o; ; [I"a = [:foo, 'bar', 2]
;TI" a[0..1] # => [:foo, "bar"]
;TI" a[1..2] # => ["bar", 2]
;T;
0o;
; [I"RSpecial case: If range.start == a.size, returns a new empty +Array+.;T@o;
; [I"NIf range.end is negative, calculates the end index from the end:;T@o; ; [ I"a = [:foo, 'bar', 2]
;TI"$a[0..-1] # => [:foo, "bar", 2]
;TI"!a[0..-2] # => [:foo, "bar"]
;TI"a[0..-3] # => [:foo]
;T;
0o;
; [I"RIf range.start is negative, calculates the start index from the end:;T@o; ; [ I"a = [:foo, 'bar', 2]
;TI"a[-1..2] # => [2]
;TI" a[-2..2] # => ["bar", 2]
;TI"$a[-3..2] # => [:foo, "bar", 2]
;T;
0o;
; [I"JIf range.start is larger than the array size, returns +nil+.;T@o; ; [ I"a = [:foo, 'bar', 2]
;TI"a[4..1] # => nil
;TI"a[4..0] # => nil
;TI"a[4..-1] # => nil
;T;
0o;
; [I"LWhen a single Enumerator::ArithmeticSequence argument +aseq+ is given, ;TI"Mreturns an +Array+ of elements corresponding to the indexes produced by ;TI"the sequence.;T@o; ; [I"7a = ['--', 'data1', '--', 'data2', '--', 'data3']
;TI"7a[(1..).step(2)] # => ["data1", "data2", "data3"]
;T;
0o;
; [I"SUnlike slicing with range, if the start or the end of the arithmetic sequence ;TI"2is larger than array size, throws RangeError.;T@o; ; [
I"7a = ['--', 'data1', '--', 'data2', '--', 'data3']
;TI"a[(1..11).step(2)]
;TI"3# RangeError (((1..11).step(2)) out of range)
;TI"a[(7..).step(2)]
;TI"1# RangeError (((7..).step(2)) out of range)
;T;
0o;
; [I"QIf given a single argument, and its type is not one of the listed, tries to ;TI";convert it to Integer, and raises if it is impossible:;T@o; ; [I"a = [:foo, 'bar', 2]
;TI"I# Raises TypeError (no implicit conversion of Symbol into Integer):
;TI"
a[:foo]
;T;
0o;
; [I"NRelated: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].;T:
@fileI" array.c;T:0@omit_headings_from_table_of_contents_below0I"self[index] -> object or nil
self[start, length] -> object or nil
self[range] -> object or nil
self[aseq] -> object or nil
slice(index) -> object or nil
slice(start, length) -> object or nil
slice(range) -> object or nil
slice(aseq) -> object or nil
;T0[[I"
slice;T@ I" (*args);T@FI"
Array;TcRDoc::NormalClass00