find_index

enum.find_index(value) â int or nil
enum.find_index { |obj| block } â int or nil
enum.find_index â an_enumerator

Instance Public methods

Compares each entry in enum with value or passes to block. Returns the index for the first for which the evaluated value is non-false. If no object matches, returns nil

If neither block nor argument is given, an enumerator is returned instead.

(1..10).find_index  { |i| i % 5 == 0 and i % 7 == 0 }  #=> nil
(1..100).find_index { |i| i % 5 == 0 and i % 7 == 0 }  #=> 34
(1..100).find_index(50)                                #=> 49

doc_ruby_on_rails

2015-04-05 00:16:24

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