Function symbolDepthInit

deprecated/node-binance-api.js:5668–5675

                };

                let symbolDepthInit = symbol => {
                    if (typeof Binance.depthCacheContext[symbol] === 'undefined') Binance.depthCacheContext[symbol] = {};
                    let context = Binance.depthCacheContext[symbol];
                    context.snapshotUpdateId = null;
                    context.lastEventUpdateId = null;
                    context.messageQueue = [];
                    Binance.depthCache[symbol] = { bids: {}, asks: {} };
                };

                let assignEndpointIdToContext = (symbol, endpointId) => {
                    if (Binance.depthCacheContext[symbol]) {