optNullableString method

String? optNullableString(
  1. String name, {
  2. bool remove = false,
})

Returns the value mapped by name if it exists, coercing it if necessary, or null if no such mapping exists. If remove is true, then the mapping will be removed from the Map.

Implementation

String? optNullableString(String name, {bool remove = false}) {
// optString() returns "null" if the key exists but contains the `null` value.
// https://stackoverflow.com/questions/18226288/json-jsonobject-optstring-returns-string-null
  if (isNull(name)) {
    return null;
  }
  String s = optString(name);
  String? value = (s != "") ? s : null;
  if (remove) {
    this?.remove(name);
  }
  return value;
}