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Opa

Opa is a programming language, originally built on ML, but with a familiar Javascript-like syntax. Opa lets you develop both the front-end and back-end in the same codebase - the type system can determine what code needs to be run where.

Specs

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Pros

Pro
Type Inferred

Opa uses type inference to decide what code runs on the client or the server, so you can organize code how you like, but still be sure that it runs where it needs to.

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Pro
Familiar Javascript Syntax

Opa's syntax is very similar to JavaScript, making it an easy choice for developers who are used to developing in JavaScript.

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Pro
Client and Server in the same language

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Cons

Con
Not popular

Opa is not as popular as other languages which compile to JavaScript. Making it harder to find learning resources or even answers if you get stuck somewhere.

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