operator overloading proposal

Kevin Barabash kevinb at khanacademy.org
Sun May 8 00:24:50 UTC 2016

Hi everyone,

I've been working on implementing operator overloading and would like to
submit a proposal.

I think operator overloading would be a useful addition to the language.
In particular I think it would be useful for defining operations on common
mathematical object types such as complex numbers, vectors, matrices, and

I've create a working prototype that consists of:

   - babel plugin that rewrites operators as function calls
   - a polyfill which defines these functions and which call the correct
   argument-specific function based on the arguments' prototypes
   - Function.defineOperator which can be used to define which function an
   operator should use for the specified types
   - "use overloading" directive which allows users to opt-in

More details can be found at
The babel plugin can be found at
I also have a demo project at

The design was inspired by some of the slides from

– Kevin
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