Recent questions tagged lambda

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lambda - Adding a method call to a Linq Expression whilst remaining an full expression

How I do extend an linq expression whilst keeping it an expression? I've simplified this quite a bit (to ... and end result an expression. 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 - Is there something like anonymous predicates in SWI Prolog?

Can I define an anonymous predicate in SWI Prolog, bind it to a variable, and call it later? Something like this: ?- F = ... }, call(F, 2.0, Y). 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 - Why didn't this java 8 example using type inference compile in Eclipse?

I am reading the newly released Java 8 in Action and found there is a piece of code pasted from Chapter 5 not ... build 25.20-b23, mixed mode) 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 - Is a C++ is_lambda trait, purely implemented as a library, impossible?

I have a question regarding C++0x lambdas. In my code, it would be beneficial to know whether or not a ... way how to implement this trait? 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# method group strangeness

I discovered something very strange that I'm hoping to better understand. var all = new List<int[]>{ new int ... Thanks for any insight. -Keith 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 - Java memoization method

I came across an interesting problem and was wondering if and how could this be done in Java: Create a method ... be done with this approach? 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 - Java 8 - fill ArrayList

Is there a better way to fill an ArrayList like this (I have done it like this ... scheduleIntervalContainers.add(scheduleIntervalContainer); 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 - passing a function as an argument in python

Suppose I want to calculate the following f(f(...f(x)..) . Basically many times function of itself. ... know what lambda functions are). 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 - java 8 parallelStream() with sorted()

JDK 8 EA is out now, and I am just trying to get used to the lambda and the new Stream API. I've ... would differ depending on the stream type? 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 - Java8 Stream over a set consistency of the order

From what i understand, Set in java is an unordered collection and an iterator will process the items in some certain ... me to create a set. 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 - lazy evaluation and late binding of python?

when is lazy evaluation? (generator, if, iterator?), when is late binding? (closure, regular functions?) a = [1,2,3, ... print i(None) # 1 2 3 4 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 - If not null - java 8 style

Java 8 presents Optional class. Before (Java 7): Order order = orderBean.getOrder(id); if (order != null) { ... convenient way in Java 8 style? 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 - Java 8 streams group by 3 fields and aggregate by sum and count produce single line output

I know there a similar questions asked in the forum but none of them seem to be addressing my problem fully. ... not that good, please help. 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 - Why is BiConsumer allowed to be assigned with a function that only accepts a single parameter?

Say, for the following example: public class MyConsumer { public void accept(int i) {} public static void biAccept( ... for it, what is it? 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 - Java 8: Target typing

While reading the article State of the Lambda I came to the topic Target Typing and I'm getting a bit ... you also provide code snippets. See Question&Answers more detail:os...

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

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891 views

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lambda - Java equivalent of Where Clause in C# Linq

I can do this in C# : int CheetahNumber = 77; Animal Cheetah = Model.Animals .Where(e => e.AnimalNo. ... I query such an ArrayList? 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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lambda - Java 8 Streams: Map the same object multiple times based on different properties

I was presented with an interesting problem by a colleague of mine and I was unable to find a neat and pretty ... get the whole thing running. See Question&Answers more detail:os...

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

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734 views

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lambda - Java 8 pass method as parameter

Currently getting into Java 8 lambda expressions and method references. I want to pass a method with no args and ... and not producing a result. 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 - What exactly does the anonymous JavaScript function f => f do?

I'm using a third-party library that has a function that takes functions as arguments. I'm doing some ... {} an empty anonymous function? 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 - What's so great about Func<> delegate?

Sorry if this is basic but I was trying to pick up on .Net 3.5. Question: Is there anything great about Func ... to suit our own needs? 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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524 views

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lambda - Understanding Spliterator, Collector and Stream in Java 8

I am having trouble understanding the Stream interface in Java 8, especially where it has to do with the ... tutorials are still very sparse. 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 - Java stream groupingBy and sum multiple fields

Here is my List fooList class Foo { private String name; private int code; private int account; private ... averagingInt(Foo::getTime) instead? See Question&Answers more detail:os...

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

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683 views

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lambda - PHP sandbox/sanitize code passed to create_function

I am using create_function to run some user-code at server end. I am looking for any of these two: Is ... around with anything else. 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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585 views

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lambda - Java stream "forEach" but not consuming stream

Sometimes it would be handy do "something" (e.g. print) with every element in a stream in between steps of ... ); How can this be achieved? 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 - How to indirectly run a method reference in Java 8?

The general questions are: When using the syntax object::aMethod, can it be converted to a type such as ... of the questions as needed. See Question&Answers more detail:os...

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

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605 views

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lambda - What is the Prolog operator `^` ("caret")?

What is the Prolog operator ^ ? Looking at The Prolog Built-in Directive op gives a list of the built-in ... instantly cleared up my confusion. See Question&Answers more detail:os...

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

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584 views

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lambda with non-static methods in Java 8

I am trying to learnd lambdas in new Java 8. There is one interesting thing. If method has the same signature as ... field or how does it work? See Question&Answers more detail:os...

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

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684 views

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lambda - How to map elements of the list to their indices using Java 8 streams?

Having a list of strings, I need to construct a list of objects which are effectively pairs (string, its ... their positions in the stream? See Question&Answers more detail:os...

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

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