Is there an Immediately Invoked Anonymous Function for Java? [duplicate]

Answer 1

No because lambdas need a target type. The best you can do is cast the expression:

Item similarItem = ((Supplier) (() -> {
    for (Item i : POSSIBLE_ITEMS) {
        if (i.name.equals(this.name)) return i;
    }
    return null;
})).get();

You must use the correct Functional Interface for your particular lambda. As you can see, it is very clunky and not useful.

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UPDATE

The above code is a direct translation of the JavaScript code. However, converting code directly will not always give the best result.

In Java you'd actually use streams to do what that code is doing:

Item similarItem = POSSIBLE_ITEMS.stream()
                                 .filter(i -> i.name.equals(this.name))
                                 .findFirst()
                                 .orElse(null);

The above code assumes that POSSIBLE_ITEMS is a Collection, likely a List. If it is an array, use this instead:

Item similarItem = Arrays.stream(POSSIBLE_ITEMS)
                         .filter(i -> i.name.equals(this.name))
                         .findFirst()
                         .orElse(null);