Functional
Java Functional API
list.replaceAll(*lambda*)
-- calls the lambda once for each item in the list, storing the result back into the list (or other type of collection).e.g. nums.replaceAll(n -> n * 2);
list.removeIf(*lambda*)
-- calls the lambda once for each item in the collection, removing each item where the lambda returns true.e.g. nums.removeIf(n -> n < 0);
Simple Lambda Examples -- the data types are inferred from the context and from the type of the expression following the "->":n -> n * 2
-- takes Integer, returns Integern -> n < 0 && n >= -10
-- takes Integer, returns booleans -> s.length()
-- takes String, returns Integers -> s.startsWith("hi")
-- takes String, returns boolean
The Java stream system provides more complicated lambda features. The stream calls do not modify the original list, returning a new data structure of the results. Note that the boolean logic of filter() is the opposite of removeIf().
The above are just the most common calls, for more information see the official Java Stream Docs
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