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join 

        # Array.join

(from ruby core)
---
    array.join ->new_string
    array.join(separator = $,) -> new_string

---

Returns the new String formed by joining the array elements after
conversion. For each element `element`
*   Uses `element.to_s` if `element` is not a `kind_of?(Array)`.
*   Uses recursive `element.join(separator)` if `element` is a
    `kind_of?(Array)`.


With no argument, joins using the output field separator, `$,`:
    a = [:foo, 'bar', 2]
    $, # => nil
    a.join # => "foobar2"

With string argument `separator`, joins using that separator:
    a = [:foo, 'bar', 2]
    a.join("\n") # => "foo\nbar\n2"

Joins recursively for nested Arrays:
    a = [:foo, [:bar, [:baz, :bat]]]
    a.join # => "foobarbazbat"

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