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Inserts the given +other_string+ into +self+; returns +self+.
If the given +index+ is non-negative, inserts +other_string+ at offset +index+:
'foo'.insert(0, 'bar') # => "barfoo"
'foo'.insert(1, 'bar') # => "fbaroo"
'foo'.insert(3, 'bar') # => "foobar"
'こんにちは'.insert(2, 'bar') # => "こんbarにちは"
If the +index+ is negative, counts backward from the end of +self+
and inserts +other_string+ _after_ the offset:
'foo'.insert(-2, 'bar') # => "fobaro"
Related: see {Modifying}[rdoc-ref:String@Modifying].
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