Ticker.fromCBJson constructor
Creates a Ticker from a Coinbase JSON object.
Implementation
Ticker.fromCBJson(Map<String, dynamic> json)
: trades = (json['trades'] as List<dynamic>?)
?.map((trade) => Trade.fromCBJson(trade as Map<String, dynamic>))
.toList(),
bestBid = nullableDouble(json, 'best_bid'),
bestAsk = nullableDouble(json, 'best_ask');