void populateSlippageCache(Symbol symbol) { var manager = new SpudManager(); var bars = bars_[symbol]; var spud = new BarSpud(manager); var calculator = symbol.slippageCalculator(spud); each(sort(bars.Keys), date => { spud.set(bars[date]); slippageCache.get(date)[symbol] = calculator.slippage(); manager.newBar(); }); }