Information Systems

Javascript threading and await This took me about an hour to figure out this morning. // this won't work var ard = await -getCheckValue("bsc"+year, '"Total Accounts Receivable"') + await getCheckValue("bsc"+(year-1), '"Total Accounts Receivable"'); putting the minus sign after await runs, but it "awaits" for the negation, not getCheckValue which is what is desired. The following works. var ard = -await getCheckValue("bsc"+year, '"Total Accounts Receivable"') + await getCheckValue("bsc"+(year-1), '"Total Accounts Receivable"'); Accounting systems generally need to be run synchronously because they have lots of transactions that depend on previous transactions. In Node.js, they tend to look like: con = await getConnection(); await con.startTransaction(); try { await con.trans1(); await con.trans2(); await con.trans3(); await con.commitTransaction(); } catch(error) { con.reverseTransaction(); } finally { con.releaseConnection(); }