linq - How to grasp all C# functional features? -

-

i'm using lambdas in c# lot (linq of many flavours, typed helpers in asp.net mvc, automapper api etc), can't start use c# functional features in own code, because can't figure out cool things can them. use them intuitively of time.

is there reference or quick (but full) guide this. i'm not looking msdn reference, quick explanation of c# functional features whole. if can narrowed down list few links blog posts -- acceptable too.

update after question closed: seems long explanation no clear, i'll try narrow down: need list of concepts can use write own code (not consume other's apis). acceplted answer need, thanks.

here nice codeproject article explains functional features introduced in c#. has easy understand examples each feature:

functional programming in c#

the article provides explanations , examples functions , first-class values:

  • function types - delegates, generic function types, predicates, actions
  • function values - storing , passing functions parameters
  • function arithmetic - adding , subtracting functions

after that, article talks functional programming in c#, covering these points:

  • using functions create generic constructs
  • using linq
  • high-order functions - functions handle other functions, function composition
  • asynchronous functions - explains begininvoke, iscompleted, endinvoke, , using asynchronous functions callbacks
  • tuples - dynamic data structures
  • closures - explains scope of variables in delegates , lambda functions, , explains sharing data , caching
  • recursion using high-order functions
  • partial functions - reducing number of function arguments using default values
  • curry functions - breaking n argument function n single argument functions

Comments

Post a Comment

Popular posts from this blog

django - How can I change user group without delete record -

-
on website user have 1 group. , user can change group. it's made user.groups.clear() and user.groups.add(new_group) but it's not efficient, because there 2 sql query: delete, insert. how can change group update query? user , group related each other using manytomanyfield . means intersection table exists relating both entities, , if don't specify model map (using through attribute) django creates 1 you. looking @ sources django.contrib.auth.models see that's case. fortunatly, can access intermediary model using through attribute of manager (in case, user.groups.through ). can use regular model. example: >>> alice = user.objects.create_user('alice', 'alice@example.com', 'alicepw') >>> employee = group.objects.create(name='employee') >>> manager = group.objects.create(name='manager') >>> alice.groups.add(employee) >>> alice.groups.all() [<group: employee...
Read more

java - Need to add SOAP security token -

-
i need set custom soap header attribute on jax-ws generated webservice client. case webservice calls must go through proxy server requiring specific token (recieved web request header) present in soap request header. e.g.: 1 carserviceservice service = null; 2 service = new carserviceservice(new url(url), new qname(qname); 3 carserviceendpoint port = service.getcarserviceport(); it seems in line 3 wsdl retrieved , call fails due missing security token. 1 point direction on how done? a detailed example has been mentioned here: creating , deploying jax-ws web service on tomcat 6 this article shows how create , use security token .
Read more

java - EclipseLink JPA Object is not a known entity type -

-
i have strange problem eclipselink , object want persist. have 1 object (keypointlistimpl) stores object keypointimpl in list. persisting keypointimpl objects works great if try persist keypointlistimpl object java.lang.illegalargumentexception says object keypointimpl isn't known entity type. here keypointimpl code: @entity @table(name="keypoints") public class keypointimpl implements keypoint { @id @generatedvalue(strategy = generationtype.identity) private int id; @enumerated(enumtype.string) private detectortype keypointtype; private float x; private float y; private float size; private float angle; private float response; private int octave; private int classid; ... } here keypointlistimpl code: @entity @table(name="keypointlists") public class keypointlistimpl implements keypointlist { @id @generatedvalue(strategy = generationtype.identity) private int id; @onetoone(cascade={ca...
Read more