Download Implementation and Application of Functional Languages: 24th by Dominic Orchard, Alan Mycroft (auth.), Ralf Hinze (eds.) PDF

By Dominic Orchard, Alan Mycroft (auth.), Ralf Hinze (eds.)

This publication comprises the chosen peer-reviewed and revised papers from the twenty fourth foreign Symposium on Implementation and alertness of useful Languages, IFL 2012, held in Oxford, united kingdom, in August/September 2012. The 14 papers integrated during this quantity have been rigorously reviewed and chosen from 28 revised submissions obtained from initially 37 displays on the convention. The papers relate to the implementation and alertness of useful languages and function-based programming.

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The two remaining arguments are placed between parentheses, so that they become arguments in the method call in the generated JavaScript code. An alternative way of writing this import is shown below, where we replace the last two explicit argument positions with a wildcard. This says that all remaining arguments should be placed where the wildcard is, saving the programmer some work. Using a wildcard has as added advantage that it becomes easy to import variadic JavaScript methods; the function’s arity is then only determined by the type signature, without the need to modify the foreign expression.

Section 3 covers the FFI with our additions, after which Sect. 4 shows how we have implemented a fully working JavaScript application completely in Haskell. Sects. 5 and 6 discuss future and related work respectively, after which Sect. 7 concludes. We assume at least some familiarity with the Haskell Foreign Function Interface (FFI) and JavaScript. 1 Runtime System There exists an obvious mismatch between Haskell and Object-Oriented (OO) languages, such as JavaScript, which has been addressed in various ways over time (Sect.

Using these functions we can now create, manipulate and query an object: main = do o ∗ mkObj "Book" setAttr "pages" 123 o modAttr "pages" ( +1) o p ∗ getAttr "pages" o print p -- Prints 124 While defining objects as shown in the previous example works fine, the process is rather verbose and tedious, especially when dealing with several object attributes. It would therefore be ideal if we could use Haskell datatypes to achieve the same results. In some ways, datatypes and JavaScript objects have a lot in common, especially when the datatype has record selectors.

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