Java / Java8 streams
What is a Predicate interface?
A Predicate is a functional interface that represents a function, which takes an Object and returns a boolean. It is used in several Stream methods like filter(), which uses Predicate to filter unwanted elements.
Predicate has test() method which takes an object and returns a boolean. The method is used to test a condition if it passes; it returns true otherwise false.
In the above example, filter method takes a predicate x -> x > 5 as argument and filters value if it is less than 5 or not.
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