When comparing asm.js vs Haste, the Slant community recommends Haste for most people. In the question“What are the best solutions to "The JavaScript Problem"?” Haste is ranked 3rd while asm.js is ranked 35th. The most important reason people chose Haste is:
Haste was designed to allow both the client and server to be written as parts of the same, type-safe application. This is in stark contrast to most other options, where the client and server are considered two separate entities, resulting in extra manual validation code and more chances for type errors.
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Pros
Pro Fast
The compiled code of asm.js can run really fast thanks to it being restricted in how it works.
Pro Client and Server as the same application
Haste was designed to allow both the client and server to be written as parts of the same, type-safe application. This is in stark contrast to most other options, where the client and server are considered two separate entities, resulting in extra manual validation code and more chances for type errors.
Pro Almost full power of Haskell
Haste supports the Haskell 2010 standard except for Template Haskell as well as most GHC extensions.
Pro Automatic, type safe program slicing
Haste lets you write client and server as a single program, automatically generating code for the server as well as the client, giving you full type safety even across the Internet.
Pro Generates small, reasonably performant code
Cons
Con Lacks some minor Haskell functionality
Lacks support for Template Haskell.