CODEWITHSUNDEEP
javalambdajava-8java-stream
zm10
zm10

Reputation: 227

Convert into Java 8 function

How can I write the following function using Java 8?

private static final Function<String, Integer> EmpIdToInt = (id) -> {   
    return Integer.valueOf(ACI.generate("emp",id).revealId().intValue());
};

Is there a better way of writing this function in Java 8?

Can anyone help?

Upvotes: 2

Views: 216

Answers (2)

holi-java
holi-java

Reputation: 30676

Note: I take away private static final for printing page.

IF your revealId is an Integer you can simplified to :

Function<String, Integer> EmpIdToInt = id -> ACI.generate("emp",id).revealId();

OR when revealId is not an Integer, but a int will be auto-boxing to an Integer, so you can remove the Integer.valueOf method call:

Function<String, Integer> EmpIdToInt = id -> ACI.generate("emp",id)
                                                .revealId().intValue();

OR you can using a curry method chaining the functions step by step:

Note: class X is where revealId method is declared, and class Y is where intValue method is declared.

// revealId is an Integer
Function<String, Integer> EmpIdToInt = curry(ACI::generate, "emp")
                                      .andThen(X::revealId);
// revealId is not an Integer
Function<String, Integer> EmpIdToInt = curry(ACI::generate, "emp")
                                      .andThen(X::revealId)
                                      .andThen(Y::intValue);

private static <T, A, R> Function<T, R> curry(BiFunction<A, T, R> it, A arg) {
    return other -> it.apply(arg, other);
}

Upvotes: 2

Ousmane D.
Ousmane D.

Reputation: 56423

Is there a better way of writing this function in java 8??

you're already using the features of java 8 and yes you can make the code shorter by removing
( ) because there is only one param and removing { } because there is only one statement of execution.

you could simplify it like so:

private static final Function<String, Integer> EmpIdToInt = id -> Integer.valueOf(ACI.generate("emp",id).revealId().intValue());

Upvotes: 3

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