Utf8.insert
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Available since: Gideros 2016.06
Class: utf8
Description
Inserts a substring to s.
(string) = utf8.insert(s,idx,substring)
If idx is given, insert substring before char at this index, otherwise substring will concat to s. idx can be negative.
Parameters
s: (string)
idx: (number) index where to insert optional
substring: (string) optional
Return values
Returns (string) new string
