before_action -> { doorkeeper_authorize! :public }, only: :index

Java8 stream 中利用 groupingBy 进行多字段分组求和

JDK中Lambda表达式的序列化与SerializedLambda的巧妙使用

lambda演算求值顺序的问题？

normalization property、type safety与soundness有什么联系？

如何评价abstracting abstract machine？

CPS变换后怎么实现的call/cc，可以详细解释吗？

C++编译器是怎么处理lambda的？

为什么Java闭包不能通过返回值之外的方式向外传递值？

Lambda 表达式、Block、闭包与匿名函数之间有什么区别？和 λ 演算有什么关系？

为什么javascript closure(闭包)要叫闭包？

Python 中的 lambda 和「真正的」lambda 有什么区别？

Lambda 表达式有何用处？如何使用？

Java 8的新特性lambda表达式是否比匿名内部类具有更好的可读性？

Java中MethodHandle的使用问题？

程序语言中的类型系统怎么理解，它有哪些要素？如何由它演化出一门编程语言的？

Java 的invokedynamic指令在是如何使用的？

Java8引入Lambda表达式的利弊？

java 8 lambda 表达式 编译后为什么在这种情况下没有生成 invokedynamic指令？

Java中普通lambda表达式和方法引用本质上有什么区别？

如何解释 Lisp 中 call/cc 的概念？

Hello, Unison author here.This is definitely an issue that is real, and is currently a problem, and that we will fix; probably by giving the function author an option to salt the hash of new definitions that have some semantic meaning beyond their implementations (appropriate for most application/business logic). No salt for definitions whose meanings are defined by their implementations (appropriate for most generic "library" functions like `List.map`).We already make this distinction for data types, but not yet for value/function definitions.

you want to pass a function as an argument to higher-order functions

Lambda functions are used when you need a function for a short period of time.

# authenticated :user, lambda {|u| u.role == "admin"} do # root to: "admin/dashboard#show", as: :user_root # end

You can also specify constraints as a lambda:

Would it be desirable to specify the new object in a block? That would make it somewhat symmetrical to how Hash.new takes a block as a default value.

When CloudFront receives a request, you can use a Lambda function to generate an HTTP response that CloudFront returns directly to the viewer without forwarding the response to the origin. Generating HTTP responses reduces the load on the origin, and typically also reduces latency for the viewer.

For this setup, do the following: 1.    Create a custom AWS Identity and Access Management (IAM) policy and execution role for your Lambda function. 2.    Create Lambda functions that stop and start your EC2 instances. 3.    Create CloudWatch Events rules that trigger your function on a schedule. For example, you could create a rule to stop your EC2 instances at night, and another to start them again in the morning.

Lambda authorizers–A Lambda authorizer is simply a Lambda function that you can write to perform any custom authorization that you need. There are two types of Lambda authorizers: token and request parameter. When a client calls your API, API Gateway verifies whether a Lambda authorizer is configured for the API method. If it is, API Gateway calls the Lambda function.In this call, API Gateway supplies the authorization token (or the request parameters, based on the type of authorizer), and the Lambda function returns a policy that allows or denies the caller’s request.API Gateway also supports an optional policy cache that you can configure for your Lambda authorizer. This feature increases performance by reducing the number of invocations of your Lambda authorizer for previously authorized tokens. And with this cache, you can configure a custom time to live (TTL).To make it easy to get started with this method, you can choose the API Gateway Lambda authorizer blueprint when creating your authorizer function from the Lambda console.

Why Use Lambda Functions? The power of lambda is better shown when you use them as an anonymous function inside another function. Say you have a function definition that takes one argument, and that argument will be multiplied with an unknown number: def myfunc(n):   return lambda a : a * n Use that function definition to make a function that always doubles the number you send in:

We can definitely observe that (memory) size matters! More memory dramatically reduces duration.

Develop a Lightweight Project With the Help of AWS, Lambda and Serverless

Lambda@Edge lets you run Lambda functions at AWS Regions and Amazon CloudFront edge locations in response to CloudFront events

The lambda expression matches the delegate it is assigned to, so it defines a method that takes one parameter of type Base and that has no return value.

private void setup(string someData) { Object.assignHandler((sender) => evHandler(sender,someData)); } public void evHandler(Object sender, string someData) { // need someData here!!! }