toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (closeSeries != null) 'closeSeries': closeSeries!,
if (highSeries != null) 'highSeries': highSeries!,
if (lowSeries != null) 'lowSeries': lowSeries!,
if (openSeries != null) 'openSeries': openSeries!,
};