ri Array

----------------------------------------------------------- Class: Array
     Convert and array into a tuple.

------------------------------------------------------------------------
     helper to check for method existance in ruby 1.8- and
     1.9-compatible way because `methods`, `instance_methods` and others
     return strings in 1.8 and symbols in 1.9

       ['foo', 'bar'].include_method?(:foo) # => true

------------------------------------------------------------------------
     Sequel extends the Array class to add methods to implement the SQL
     DSL. Most of these methods require that the array not be empty and
     that it must consist solely of other arrays that have exactly two
     elements.

------------------------------------------------------------------------
     helper to check for method existance in ruby 1.8- and
     1.9-compatible way because `methods`, `instance_methods` and others
     return strings in 1.8 and symbols in 1.9

       ['foo', 'bar'].include_method?(:foo) # => true

------------------------------------------------------------------------


Includes:
---------
     Diff::LCS(diff, lcs, patch, patch!, sdiff, traverse_balanced,
     traverse_sequences, unpatch, unpatch!), Indexable(body, ends,
     first, first!, first=, foot, head, index, index_of, last, last!,
     last=, mid, middle, pos, range, tail, thru),
     Mocha::ArrayMethods(mocha_inspect), Random(), Stackable(peek, poke,
     pop, pull, push, shift, unshift)


Instance methods:
-----------------
     all_two_pairs?, case, collapse, combination, conjoin,
     delete_unless, delete_values, delete_values_at, dissolve,
     flatten_one_level, include_method?, index, last=, mean, merge!,
     nonempty?, not_empty?, object_state, one?, only, pad, pad!,
     permutation, power_set, product, recursively, recursively!, rest,
     rotate, rotate!, select!, shelljoin, shellwords, splice, sql_array,
     sql_expr, sql_negate, sql_or, sql_string_join, sum, to_b,
     to_boolean_h, to_h, to_h_assoc, to_h_auto, to_h_flat, to_h_multi,
     to_h_splat, to_t, traverse, traverse!, uniq_by!, ~