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The firstWord() operator has one argument, dataStr (a quoted string), and it returns the first word of dataStr. The delimiter used to define words is one or more spaces (possibly also line break(s)?).
The dataStr argument is evaluated so could be an expression. For example, if the note 'First Line' has the body text "Winter is coming.", then
$MyString = firstWord($Text("First Line"));
should give a result of "