At the Build 2018 developer conference that’s taking place these days in Seattle, USA, Microsoft announced support for custom JavaScript functions in Excel.
What this means is that Excel users will be able to use JavaScript code to create a custom Excel formula that will appear in Excel’s default formula database.
Users will then be able to insert and call these formulas from within Excel spreadsheets, but have a JavaScript interpreter compute the spreadsheet data instead of Excel’s native engine.
Java such a security issue why are people still using it now adding it to excel makes it worse.