Caché ObjectScript Reference - InterSystems Documentation

Symbols and AbbreviationsSymbol""###$$$Name and UsageDouble quotes: Used to specify the null string (""), which is a zerolengthstring.Used to specify a literal quote character within a quoted string.Pound sign (35): Binary modulo division operator.In READ and WRITE commands, form feed. In fixed-length READ,number of characters to read.Prefix for referencing the value of a class parameter from withinthe class: #ParameterName.Macro directives prefix: #Define, #Include, #IfDelimiter for a runtime expression: #(expr)#, where expr is a CachéObjectScript expression.In the callout routine ZFENTRY, an argtype prefix indicating aDOUBLE data type: #D or #F.Double pound sign: Object class method invocation prefix: DO##class(method).##this syntax provides a handle to the OREF of the current objectinstance. ##super() syntax is used to invoke an overridden superclassmethod.SQL shell invocation prefix: ##sql(SQL command).Delimiter for a compile-time expression: ##(expr)##, where expr isa Caché ObjectScript expression.Dollar sign (36): Intrinsic (system) function prefix: $name(parameters).Special variable prefix: $name.With ZBREAK command.As first character at terminal prompt, load interactive subshell.Double dollar sign: Extrinsic (user-written) function prefix:$$name(parameters). $$ is returned by $STACK when context wasestablished by an extrinsic function reference.Prefix to a routine name to directly invoke that routine.2 Caché ObjectScript Reference