Tutorial by Topics: filters

This extension filters data by either validating or sanitizing it. This is especially useful when the data source contains unknown (or foreign) data, like user supplied input. For example, this data may come from an HTML form.

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).

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