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/Dart 2

putIfAbsent method

String putIfAbsent (String key, String ifAbsent())

Implementation

String putIfAbsent(String key, String ifAbsent()) {
  if (!containsKey(key)) this[key] = ifAbsent();
  return this[key];
}

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/Storage/putIfAbsent.html