Name
xlsx.IsSheetActive -- check if sheet is active
Synopsis
active = xlsx.IsSheetActive(id[, sheet])
Function
This function returns True if the worksheet specified by sheet is active, False otherwise. The sheet parameter is optional. If it is omitted, the worksheet set by xlsx.SetDefaultSheet() will be used. Sheet indices start at 1 for the first worksheet.

Inputs
id
identifier of the XLSX document to use
sheet
optional: index of the worksheet to use (defaults to the index of the default worksheet)
Results
active
True if the sheet is active, False otherwise
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