Utf8.insert

Available since: Gideros 2016.06

Description

Insert a substring to s. If idx is given, insert substring before char at this index, otherwise substring will concat to s. idx can be negative.

(string), = utf8.insert(sidxsubstring,)

's: (string) '
idx: (number) index where to insert optional
substring: (string) optional
Returns (string) new string