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insert 

        # Array.insert

(from ruby core)
---
    array.insert(index, *objects) -> self

---

Inserts given `objects` before or after the element at Integer index
`offset`; returns `self`.

When `index` is non-negative, inserts all given `objects` before the
element at offset `index`:
    a = [:foo, 'bar', 2]
    a.insert(1, :bat, :bam) # => [:foo, :bat, :bam, "bar", 2]

Extends the array if `index` is beyond the array (`index >= self.size`):
    a = [:foo, 'bar', 2]
    a.insert(5, :bat, :bam)
    a # => [:foo, "bar", 2, nil, nil, :bat, :bam]

Does nothing if no objects given:
    a = [:foo, 'bar', 2]
    a.insert(1)
    a.insert(50)
    a.insert(-50)
    a # => [:foo, "bar", 2]

When `index` is negative, inserts all given `objects` *after* the
element at offset `index+self.size`:
    a = [:foo, 'bar', 2]
    a.insert(-2, :bat, :bam)
    a # => [:foo, "bar", :bat, :bam, 2]

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