Recent questions tagged lambda

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lambda - Why doesn't java.util.Collection implement the new Stream interface?

I just took some time to start looking into the java-8 buzz about streams and lambdas. What surprised me is that you cannot ... .map(x -> f(x)); See Question&Answers more detail:os...

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

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lambda - Find maximum, minimum, sum and average of a list in Java 8

How to find the maximum, minimum, sum and average of the numbers in the following list in Java 8? List<Integer> primes = ... , 17, 19, 23, 29); See Question&Answers more detail:os...

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

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lambda - How to apply multiple predicates to a java.util.Stream?

How can I apply multiple predicates to a java.util.Stream's filter() method? This is what I do now, but I don ... know it looks sort of ugly... See Question&Answers more detail:os...

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

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lambda - Using 'return' in a Ruby block

I'm trying to use Ruby 1.9.1 for an embedded scripting language, so that "end-user" code gets written in a ... , but the result is the same. See Question&Answers more detail:os...

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

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lambda function don't closure the parameter in Python?

Code talks more: from pprint import pprint li = [] for i in range(5): li.append(lambda : pprint(i)) for k in li ... closure(i)) for k in li: k() See Question&Answers more detail:os...

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

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lambda - Java 8: Where is TriFunction (and kin) in java.util.function? Or what is the alternative?

I see java.util.function.BiFunction, so I can do this: BiFunction<Integer, Integer, Integer> f = (x, ... behind not including it in the standard library. Question&Answers:os...

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

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lambda - Java 8, Streams to find the duplicate elements

I am trying to list out duplicate elements in the integer list say for eg, List<Integer> numbers = Arrays. ... duplicated elements ? Anybody can help me out ? Question&Answers:os...

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

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713 views

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lambda - Filter Java Stream to 1 and only 1 element

I am trying to use Java 8 Streams to find elements in a LinkedList. I want to guarantee, however, that there is ... matches, though. Is there a way to do this? Question&Answers:os...

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

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lambda - Java 8 method reference unhandled exception

I'm working on project with Java 8 and found one situation which I can't understand. I have code like this: ... for each loop and doesn't compile with lambda? Question&Answers:os...

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

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lambda - Chaining Optionals in Java 8

Looking for a way to chain optionals so that the first one that is present is returned. If none are ... expects a value and orElseGet expects a Supplier. Question&Answers:os...

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

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858 views

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lambda - Optional orElse Optional in Java

I've been working with the new Optional type in Java 8, and I've come across what seems like a common operation ... a pretty glaring omission to the API to me. Question&Answers:os...

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

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lambda - Retrieving a List from a java.util.stream.Stream in Java 8

I was playing around with Java 8 lambdas to easily filter collections. But I did not find a concise way to ... can be directly be assigned by the third line? Question&Answers:os...

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

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lambda - What is a 'SAM type' in Java?

Reading up on the Java-8 spec, I keep seeing references to 'SAM types'. I haven't been able to find a ... is an example scenario of when one might be used? Question&Answers:os...

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

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784 views

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lambda - Java 8: Difference between method reference Bound Receiver and UnBound Receiver

I am trying to use Java 8 method references in my code. There are four types of method references available. ... but was still confused with the actual concept. Question&Answers:os...

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

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654 views

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lambda - Precise definition of "functional interface" in Java 8

Recently I started exploring Java 8 and I can't quite understand the concept of "functional interface" that is ... abstract method? What am I missing here? Question&Answers:os...

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

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791 views

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lambda - Java 8 Streams: multiple filters vs. complex condition

Sometimes you want to filter a Stream with more than one condition: myList.stream().filter(x -> x.size( ... readability, but what is better for the performance? Question&Answers:os...

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

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925 views

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lambda - Uncaught TypeError: Illegal invocation in javascript

I'm creating a lambda function that executes a second function with a concrete params.This code works in Firefox but ... (console.log,'it will be accepted!'); Question&Answers:os...

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

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lambda - Using Java 8's Optional with Stream::flatMap

The new Java 8 stream framework and friends make for some very concise java code, but I have come across a ... very common case. Anyone have a better idea? Question&Answers:os...

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

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753 views

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lambda - What are functional interfaces used for in Java 8?

I came across a new term in Java 8: "functional interface". I could only find one use of it ... of functional interfaces besides use with lambda expressions?) Question&Answers:os...

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

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651 views

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lambda - How can I throw CHECKED exceptions from inside Java 8 streams?

How can I throw CHECKED exceptions from inside Java 8 streams/lambdas? In other words, I want to make code ... without adding ugly try/catches to the stream. Question&Answers:os...

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

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654 views

1 answer

lambda - Why filter() after flatMap() is "not completely" lazy in Java streams?

I have the following sample code: System.out.println( "Result: " + Stream.of(1, 2, 3) .filter(i ... first case. Any helpful information would be appreciated. Question&Answers:os...

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

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837 views

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lambda - Java 8 List<V> into Map<K, V>

I want to translate a List of objects into a Map using Java 8's streams and lambdas. This is how I ... { return Maps.uniqueIndex(choices, Choice::getName); } Question&Answers:os...

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

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844 views

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lambda - what is '@' means in scheme language?

I am trying to understand the following function: ((lambda 'b ((lambda 'a '''''a) 'b `(this))) ... :https://stackoverflow.com/questions/65919011/what-is-means-in-scheme-language...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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lambda - Stream and map a list to a map in java

I want to do something like the following with java 8 and lambda expression. Map<String, String> headers = service. ... /65920993/stream-and-map-a-list-to-a-map-in-java...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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654 views

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lambda - Installing a Recursive Function Using symbol-function

A function can be installed programmatically in Common Lisp using symbol-function (instead of defun): * ... questions/65931001/installing-a-recursive-function-using-symbol-function...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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568 views

1 answer

lambda - Java 8 : Iterate from 2 lists and create a Map<String, Custom Object>

I have a list of class A and class B with no duplicate elements. "code" attribute will be same across both ... java-8-iterate-from-2-lists-and-create-a-mapstring-custom-object...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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617 views

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lambda calculus - Does SKS equal SKK?

Context I started teaching myself lambda calculus last night and I am trying to determine if what I understand ... https://stackoverflow.com/questions/65947033/does-sks-equal-skk...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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842 views

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lambda - Serverless Framework dynamobd iamRoleStatements modify -> AccessDeniedException

I've inherited an API that uses ddb. Unfortunately, everything is being done on ... questions/65947745/serverless-framework-dynamobd-iamrolestatements-modify-accessdeniedexception...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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