List Filters

Introduction#

Dart filters lists through the List.where and List.retainWhere methods. The where function takes one argument: a boolean function that is applied to each element of the list. If the function evaluates to true then the list element is retained; if the function evaluates to false, the element is removed.

Calling theList.retainWhere(foo) is practically equivalent to setting theList = theList.where(foo).

Filtering a list of integers

[-1, 0, 2, 4, 7, 9].where((x) => x > 2) --> [4, 7, 9]