getDouble abstract method

double getDouble({
  1. required String key,
  2. double defaultValue = -1.0,
})

Returns the double value linked to the key, otherwise defaultValue.

If key does not exist in the JSON object, or if there is a specific default value that you want to return when the value associated with key is null, set it to the argument defaultValue.

Implementation

double getDouble({
  required String key,
  double defaultValue = -1.0,
});