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concat 

        # String.concat

(from ruby core)
---
    concat(*objects) -> string

---

Concatenates each object in `objects` to `self` and returns `self`:

    s = 'foo'
    s.concat('bar', 'baz') # => "foobarbaz"
    s                      # => "foobarbaz"

For each given object `object` that is an Integer, the value is
considered a codepoint and converted to a character before
concatenation:

    s = 'foo'
    s.concat(32, 'bar', 32, 'baz') # => "foo bar baz"

Related: String#<<, which takes a single argument.

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