getAsDouble method

double getAsDouble(K key, [ double orElse = 0.0 ])

Retrieves the element of key of type double from Map.

If Map does not have an element of key or the type does not match double, orElse is returned.

Mapからdouble型のkeyの要素を取得します。

Mapにkeyの要素がない場合やdoubleと型が合わない場合、orElseが返されます。

Implementation

double getAsDouble(K key, [double orElse = 0.0]) {
  assert(key != null, "The key is empty.");
  if (!containsKey(key) || this[key] is! num?) {
    return orElse;
  }
  return (this[key] as num?)?.toDouble() ?? orElse;
}