Down the Lambda (Functions) Hole!

Related image

Further adventures Down the Lambda (Functions) Hole...

I decided to learn Python for Data Analytics recently so jumped into the language for a few days. I soon noticed that it support Lambda Functions. Cool, they've been around for a ages.

Alonzo Church invented Lambda Calculus in the 1930's, and this influenced languages like LISP (which I learnt years ago but soon replaced with Prolog as my preferred AI language).

So the Clever Thing about Lambda Functions is that they are anonymous (no name), and are used in conjunction with Higher Order Functions (Functions that can take Functions are arguments and return Functions).

A number of questions came to mind in relationship to Data Analytics, AWS, languages etc:

1 Is Python the best/only DA language to support Lambda Functions?
2 Are they useful/essential for DA?
3 What's the connection to Map/Reduce (from LISP but now Hadoop etc)?
4 Does Java support Lambda Functions? Well?
5 What good examples are there in for them in DA (other than MapReduce? And is MapReduce actually Lambda?)
6 What about AWS Lambda Functions? Are they actually???
7 Are there other Cloud/Serverless architectures that ARE Lambda Functions?

In no particular order, AWS Lambda Functions. Are they? Not really.  As this blog points out they are NOT anonymous, but do take a single arg. Can they be recursive? Take and return functions? Not sure TODO.

https://www.developmentseed.org/blog/2016/03/08/aws-lambda-functions/


Does Java support Lambda Functions? Yes, since Java 8 (whoops, missed it).

https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html

http://www.javaworld.com/article/2092260/java-se/java-programming-with-lambda-expressions.html 

And Lambda and Streams example: http://javarevisited.blogspot.com.au/2014/02/10-example-of-lambda-expressions-in-java8.html 

How do they work in Java? Here's a good under the hood explanation.

And yes, Java Lambdas are Higher Order functions. 

A good intro to functions in Python.

And another.

And confusion around Python Lambda functions and AWS Lambdas functions.

But AWS Lambda functions can be called recursively, which lots of people have used to solve various limitations including timeouts, for SQS, etc.



Comments

  1. Staarwd7 August 2018 at 08:22

    It is usually acknowledged as a big pool of programs that helps us to stay related with personal or public networks and to supply dynamically scalable infrastructure for knowledge, file storage and utility.This is great blog. If you want to know more about this visit here AWS Cloud Certification.

    ReplyDelete
  2. Prepare4test21 April 2022 at 10:11

    Download the Microsoft 98-361 Q&A PDF file easily to prepare Software Development Fundamentals exam. It is particularly designed for Microsoft 98-361 exam and our Microsoft specialists have created this 98-361 Question Dumps observing the original 98-361 exam.

    ReplyDelete
  3. Anonymous1 May 2022 at 08:20

    mmorpg oyunlar
    İnstagram takipci satin al
    TİKTOK JETON HİLESİ
    TİKTOK JETON HİLESİ
    Sac ekimi antalya
    referans kimliği nedir
    İnstagram Takipçi Satın Al
    metin2 pvp serverlar
    instagram takipçi satın al

    ReplyDelete
  4. Anonymous17 May 2022 at 21:56

    TÜL PERDE MODELLERİ
    Numara Onay
    Mobil ödeme bozdurma
    nft nasıl alınır
    ankara evden eve nakliyat
    trafik sigortası
    dedektör
    Web site kurma
    AŞK ROMANLARI

    ReplyDelete
  5. L Ganesh20 May 2022 at 07:26

    Thank you for sharing wonderful information with us to get some idea about that content.
    Learn AWS Online
    AWS Certification Online

    ReplyDelete
  6. Anonymous30 May 2022 at 05:40

    Smm panel
    SMM PANEL
    iş ilanları
    instagram takipçi satın al
    Hırdavatçı Burada
    www.beyazesyateknikservisi.com.tr
    servis
    Jeton hilesi

    ReplyDelete

Post a Comment

Popular posts from this blog

Which Amazon Web Services are Interoperable?

Image
Which Amazon Web Services are Interoperable? This is a question I asked when I started studying for AWS certification, asked a few AWS certified architects at Sydney Summit 201 (the answer typically was "all of them as they all use REST APIs", really?), and have attempted to answer from the documentation. They only way I could think to answer this so far is go through the documentation for the 3500 services (according to April AWS service update) and create a dependencies graph (which services interoperate with which other services).  I've also noticed that some of the certification questions ask which for AWS X, which other AWS services interoperate with it? So obviously it's important. Obviously AWS could answer this by monitoring (E.g. with X-Ray) which services call or are called with services and create a interoperability graph and frequency of calls. I've since come up with another approach to answer this.  I've used the 16 aws reference architecture
Read more

AWS Certification glossary quiz: IAM

Image
I also keep getting stuck on IAM and key related questions so here's a quiz on IAM. Qn1  One of two possible outcomes (the other is  deny ) when an  IAM  access  policy  is evaluated. When a user makes a request to AWS, AWS evaluates the request based on all permissions that apply to the user and then returns either deny or this one. alarm permit true allo w Qn2  A web service that enables  Amazon Web Services  (AWS)  customers to manage users and user permissions within AWS. AWS user service (AUS) AWS customer service (ACS) AWS access management (AAM) AWS Identity and Access Management  (IAM) Qn3:  An  IAM   managed policy  that is created and managed by AWS. AWS management AWS policy AWS IAM policy AWS managed policy Qn4:  A web service for requesting temporary, limited-privilege credentials for  AWS Identity and Access Management  (IAM)  users or for users that you authenticate ( federated users ). AWS credential service (AWS ACS) AWS token service
Read more

AWS SWF vs Lambda + step functions? Simple answer is use Lambda for all new applications.

Image
I do like my Lamb (daaaa)! What's the difference between SWF and Lambda + step functions? Well, for a start they can be used together. Benefits and Limitations of using Lambda Tasks There are a number of benefits of using Lambda tasks in place of a traditional Amazon SWF activity: Lambda tasks don’t need to be registered or versioned like Amazon SWF activity types. You can use any existing Lambda functions that you've already defined in your workflows. Lambda functions are called directly by Amazon SWF; there is no need for you to implement a worker program to execute them as you must do with traditional activities. Lambda provides you with metrics and logs for tracking and analyzing your function executions. There are also a number of limitations regarding Lambda tasks that you should be aware of: Lambda tasks can only be run in AWS regions that provide support for Lambda. See  Lambda Regions and Endpoints  in the  Amazon Web Services General
Read more