ary.index(obj) â int or nilary.index { |item| block } â int or nilary.index â Enumerator
Instance Public methods
Returns the index of the first object in ary such
that the object is == to obj.
If a block is given instead of an argument, returns the index of
the first object for which the block returns true. Returns
nil if no match is found.
See also #rindex.
An Enumerator is returned if neither a block
nor argument is given.
a = [ "a", "b", "c" ]
a.
