getAsNullableDouble method
Converts map element into a double or returns null if conversion is not possible.
key
a key of element to get. Returns double value of the element or null if conversion is not supported.
See DoubleConverter.toNullableDouble
Implementation
double? getAsNullableDouble(String key) {
var value = get(key);
return DoubleConverter.toNullableDouble(value);
}