[String->ToUpper] modifies the string object in-place by converting a specified character in the string to uppercase. Requires a single integer parameter, which indicates the position of the character to change.
Use the [String->ToUpper] method. The following example converts a single character in a string object to upper case, then outputs the string.
local('s') = 'a quick white rhino' #s->toupper(3) #s
a Quick white rhino
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