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Recent questions tagged lambda

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lambda - Key indicators that a Java 8 stream will run slower than a for loop?

Java 8 streams allow code that is a lot more readable than old-fashioned for loops, in most cases. However ... limit this to sequential streams. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

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lambda - python return lists of continuous integers from list

I have a list of integers, and I want to generate a list containing a list of all the continuous integers. #I ... will be between 0 and 59. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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lambda - C# Cannot use ref or out parameter inside an anonymous method body

I'm trying to create a function that can create an Action that increments whatever integer is passed in. However ... with the two-lambda option? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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439 views

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lambda - threading macro -> with anonymous functions

I understand the `-> theading macro in Clojure applies all the provided functions provided to a given argument. ... would be helpful. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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364 views

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lambda - Going from Curry-0, 1, 2, to ...n

Following up from a previous question I asked about writing a curry function, How to create a make-curry function ... How could this be done? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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652 views

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lambda - java 8 how to get distinct list on more than one property

How can one get the distinct (distinct based on two property) list from a list of objects. for example let ... is not the expected result. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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883 views

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lambda - Reason for the exception java.lang.VerifyError: Bad type on operand stack

The below simple java code sends the java.lang.VerifyError: Bad type on operand stack exception public class ... the reason for this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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354 views

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lambda - Are Java streams stages sequential?

I have a question on the intermediate stages sequential state - are the operations from a stage applied to all the ... it's not clear enough. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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370 views

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lambda - Creating Python function with partial parameters

I want to pass a Python function to another function with some of its parameters "filled out" ahead of time. This ... way to do this? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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379 views

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lambda - Python create function in a loop capturing the loop variable

What's going on here? I'm trying to create a list of functions: def f(a,b): return a*b funcs = [] for i in ... = 9 funcs[2](6) = 54 Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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lambda - Why should variables inside a forEach loop not be changed?

I am iterating a list in Java 7 loop and Java 8 forEach loop. The Java 8 loop wants the variables inside it to ... Is it a drawback of Java 8? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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329 views

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lambda - Does Java 8 Support Closures?

I'm confused. I thought Java 8 was going to emerge from the stone age and start supporting lambdas/closures ... Android support Java 8 features? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

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lambda - Stream.peek() method in Java 8 vs Java 9

I am in the progress of learning through Java 8 lambda expressions and would like to ask about the following piece of ... print) .count(); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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410 views

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lambda - What is call/cc?

I've tried several times to grasp the concept of continuations and call/cc. Every single attempt was a failure. Can ... my head around call/cc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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375 views

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lambda - Function pointer to String method in Java

I don't understand a couple of things with lambda. String s = "Hello World"; Function<Integer, String> f = s::substring; s ... f = t -> t + ""; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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388 views

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lambda - Python closure not working as expected

When I run the following script, both lambda's run os.startfile() on the same file -- junk.txt. I would ... __name__ == '__main__': main() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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396 views

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lambda - Reference to method of a particular instance in Kotlin

In Java 8 we can have a reference to a method of a Class' instance. Here's an example Function1<Integer, Object> ref ... Any = { a.getItem(it) } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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406 views

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lambda - Purpose of third argument to 'reduce' function in Java 8 functional programming

Under what circumstances is the third argument to 'reduce' called in Java 8 streams? The code below attempts to traverse ... (a,b) -> 1000000); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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438 views

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lambda - Python one-line "for" expression

I'm not sure if I need a lambda, or something else. But still, I need the following: I have an array = [1, ... 's the best I could come up with) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

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lambda - Built-in Java 8 predicate that always returns true?

Google Guava has a predicate that always returns true. Does Java 8 have something similar for its Predicate? I ... to Collections.emptySet(). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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658 views

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lambda - How do I set a field value in an C# Expression tree?

Given: FieldInfo field = <some valid string field on type T>; ParameterExpression targetExp = Expression.Parameter( ... parameter to "value"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

528 views

1 answer

lambda - Non-interference exact meaning in Java 8 streams

Does the non-interference requirement for using streams of non-concurrent data structure sources mean that we can't ... forEach)? (Question 4) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

lambda - Java 8 optional: ifPresent return object orElseThrow exception

I'm trying to make something like this: private String getStringIfObjectIsPresent(Optional<Object> object){ object.ifPresent(( ... to do it ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

lambda - How to get String from Mono<String> in reactive java

I have a method which accepts Mono as a param. All I want is to get the actual String from it. Googled but ... { System.out.println(str); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

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lambda - C# => operator?

I have a question about the => operator in C#. I am looking at the Expression Blend 4 samples. There is ... doing? Is it overriding something? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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607 views

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lambda - Java 8 Collectors.toMap SortedMap

I'm using Java 8 lambdas and want to use Collectors toMap to return a SortedMap. The best I can come ... Collectors to return a SortedMap? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

767 views

1 answer

lambda - Java 8 Supplier with arguments in the constructor

Why do suppliers only support no-arg constructors? If the default constructor is present, I can do this: create(Foo:: ... -> new Foo("hello")) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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331 views

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lambda - Alan Kay's Eval/Apply Einstein Moment

Alan Kay said that reading the code closely and finding the 1 and only bug in the code on page 13 of the Lisp 1.5 ... evlis (cdr m) a))))))) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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