javascript monad

Remember our last delegate type of parser, before starting this article, we strongly recommend that you review this parser definition Public Delegate Maybestring>>Parserstring input)Remember how hard it was for us to combine these parser? Now that we've converted parser to monad in a new way, we've learned how to convert generic and generic interfaces to Monad, and you can also convert delegates to MonadFir

In Haskell, we have the syntax sugar ' do ' to help express the monad operation. We also have the corresponding syntax sugar ' for ' in Scala. The for expression will be transformed by Scala compiler, with the following simple examples: for { foo yield (A + B)===>Foo.flatmap ((a) + = {= = {+ b })})So we need to implement two methods Flatmap and map.or using the previous state Monad as an example,

most graceful one you've ever seen, but it's critical to take a look at the different types of amplified type that we can manipulate without accessing the Value property. Remember the two facts: first, in the future we can remove the lambda expression, followed by identityIdentityBind:funcToidentity:funcBind is where we write Monad features, and is the only place where it is very powerful abstraction and is also the most attractive place for monad.Ne

When the input data format is not correct, there will be a outofindex error in Activitydata, but more often we only care about the desired results and do not want to know what the error, and then write such a codedef parseCSV(csv : String) = {try {Some {csv.split("\n").map { line =>val tokens = line.split(";")ActivityData(tokens(0).toLong, tokens(1).toInt, tokens(2).toInt, tokens(3).toLong)}}} catch {case _ : Throwable => None}}And after import Scala.util.Try, we can write this code.def parseCSV

State Monad in C ++, statemonadin A c ++ version of State Monad. C ++ 11 is required. #include

A C + + version of State Monad. Need c++11. #include TemplateclassM>structMonad {Template0; Template0;}; Templatestructtuple{A _1; B _2;}; TemplatestructState {TemplatestructType:monad{std::functionrunstate; Templateret (a a) {std::function{TupleR; R._1=s; R._2=A; returnR; }; Types; S.runstate=F; returns; } templatef) {std::function{std::functionfa.runstate; TupleF0 (s); Std::functionf (r._2). Runstate; returnF1 (r._1); }; Types;

by the relationship between Javascript and Java, just as its name implies what it will be! But in fact it has very little in common with Java. However, there are some ideas to force Javascript into object-oriented languages. libraries such as Dojo and idea. js have done a lot of work to abstract Javascript to make it suitable for object-oriented programming.

-coat. Its syntax is undoubtedly similar to C, which means it uses the block grammar of C language and the infix word order. And it's the worst name in the existing language. You don't have to imagine how many people will be confused by JavaScript and Java relationships, as if their name implied what it would be! But in fact it has very little in common with Java. But there are some ideas to force JavaScript