localeCompare is not a function

Java String equalsIgnoreCase() Method The equalsIgnoreCase() method compares two strings, ignoring lower case and upper case differences. This method returns true if the strings are equal, and false if not. Tip: Use the compareToIgnoreCase() method to compare two strings lexicographically, ignoring case differences.

C#: List. Contains Method – Case Insensitive.

There’s no built in way to compare strings case-insensitive in dart (as @lrn answered). Show activity on this post. There is no case-insensitive string compare function (or string equality function for that matter) in Dart.17 Oca 2017