getDouble method

double getDouble(
  1. String key, [
  2. double? defaultValue
])

returns the value corresponding with key as double if null returns defaultValue

Implementation

double getDouble(String key, [double? defaultValue]) {
  var val = optDouble(key, defaultValue);
  if (val == null) {
    throw MissingRequiredParameterError(
        'Failed to parse [double] $key value from ${_params[key]}');
  }
  return val;
}