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Invoking default methods from lambdas


Invoking default methods from lambdas

By : Kofi Operon
Date : November 22 2020, 12:01 PM
wish of those help That would lead to a StackOverflowError : bar calls combine, which calls bar, which calls combine...
You need to recursively refer to sc in its definition (you can't use this in a lambda to refer to the object being created by the lambda). I believe that is only possible in an instance or class variable. So it could look like:
code :
@FunctionalInterface
public interface StringCombiner {
    String combine(String s1, String s2);
    default String bar(String s1, String s2) { return "bar"; }
}

//Note: you need the static block to avoid a "self-reference" compilation error
static StringCombiner sc;
static {
  sc = (s1, s2) -> sc.bar(s1, s2) + s1 + s2;
}

public static void main(String[] args) {
    System.out.println(sc.combine("a", "b"));
}


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Invoking Lambdas at Creation

Invoking Lambdas at Creation


By : user3809961
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You don't need the outer lambda in C#, it can be replaced by a simple block.
Directly invoking a lambda is a workaround for the lack of block level variables in Javascript (new versions support block scope using let).
code :
Func<int> counter;

{
     int n = 0;
     counter = () => n++;
}
Why are parenthesis required for invoking methods with default arguments?

Why are parenthesis required for invoking methods with default arguments?


By : André Debayeux
Date : March 29 2020, 07:55 AM
I hope this helps . This is probably intentional so you don't get parameter blocks disappearing on you:
code :
def foo(x: Int = 2)(y: Int = 4) = x*y

foo(3)    // What does this mean???
Which way of invoking lambdas in C++ is the most idiomatic?

Which way of invoking lambdas in C++ is the most idiomatic?


By : Ryan
Date : March 29 2020, 07:55 AM
it fixes the issue
I noticed that lambdas both work using function pointers as well as the dedicated function type
code :
template <typename Function>
int apply(Function && f, int a, int b) {
     return f(a,b);
}
Lambdas stop invoking after a period of time

Lambdas stop invoking after a period of time


By : user1991685
Date : March 29 2020, 07:55 AM
hop of those help? It was the warmer (Node) lambda going haywire, even though all the logs pointed at the worker (Python) lambdas. After setting context.callbackWaitsForEmptyEventLoop = false, the problem disappeared.
How do Java 8 default methods hеlp with lambdas?

How do Java 8 default methods hеlp with lambdas?


By : user2681478
Date : March 29 2020, 07:55 AM
seems to work fine To give you an example take the case of the Collection.forEach method, which is designed to take an instance of the Consumer functional interface and has a default implementation in the Collection interface:
code :
default void forEach(Consumer<? super T> action) {
    Objects.requireNonNull(action);
    for (T t : this) {
        action.accept(t);
    }
}
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