get<T> method

T? get<T>(String key, [ ReturnDefaultValueCallback<T>? defaultValue ])

Returns the value of the given key in the data map.

This tries to cast or parse the value to the given T type. If it fails, then value from defaultValue is returned if defaultValue callback is provided.

Implementation

T? get<T>(
  String key, [
  ReturnDefaultValueCallback<T>? defaultValue,
]) {
  final val = data[key];
  if (val == null) return null;
  if (val is T) return val;

  if (T == String) {
    return val.toString() as T?;
  } else if (T == num) {
    if (val is num) return val as T?;
    return num.tryParse(val.toString()) as T?;
  } else if (T == int) {
    if (val is int) return val as T?;
    return int.tryParse(val.toString()) as T?;
  } else if (T == double) {
    if (val is double) return val as T?;
    return double.tryParse(val.toString()) as T?;
  }
  return defaultValue?.call();
}