{"id":166405,"date":"2014-03-18T00:00:00","date_gmt":"2014-03-18T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/koka-programming-with-row-polymorphic-effect-types-2\/"},"modified":"2018-10-16T20:16:41","modified_gmt":"2018-10-17T03:16:41","slug":"koka-programming-with-row-polymorphic-effect-types-2","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/koka-programming-with-row-polymorphic-effect-types-2\/","title":{"rendered":"Koka: Programming with Row Polymorphic Effect Types"},"content":{"rendered":"<div class=\"asset-content\">\n<p>We propose a programming model where effects are treated in a disciplined way, and where the potential side-effects of a function are apparent in its type signature. The type and effect of expressions can also be inferred automatically, and we describe a polymorphic type inference system based on Hindley-Milner style inference. A novel feature is that we support polymorphic meffects through row-polymorphism using duplicate labels. Moreover, we show that our effects are not just syntactic labels but have a deep semantic connection to the program. For example, if an expression can be typed without an <i>exn<\/i> effect, then it will never throw an unhandled exception. Similar to Haskell&#8217;s `runST` we show how we can safely encapsulate stateful operations. Through the state effect, we can also safely combine state with let-polymorphism without needing either imperative type variables or a syntactic value restriction. Finally, our system is implemented fully in a new language called Koka and has been used successfully on various small to medium-sized sample programs ranging from a Markdown processor to a tier-splitted chat application. You can try out Koka live at http:\/\/www.rise4fun.com\/koka\/tutorial.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We propose a programming model where effects are treated in a disciplined way, and where the potential side-effects of a function are apparent in its type signature. The type and effect of expressions can also be inferred automatically, and we describe a polymorphic type inference system based on Hindley-Milner style inference. A novel feature is [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"user_nicename","value":"daan"}],"msr_publishername":"EPTCS","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"Mathematically Structured Functional Programming 2014","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"Creative Commons Attribution","msr_conference_name":"Mathematically Structured Functional Programming 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