Are functions in JavaScript tail-call optimized?

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Update: As of January 1, 2020 Safari is the only browser that supports tail call optimization.

The chromium team explicitly states that Tail Call Optimization is not under active development and can be tracked here.

The implementation for Firefox can be tracked here

Original Post

Yes, ES2015 offers tail call optimization in strict mode. Dr. Axel Rauschmayer lays it out beautifully at the link below so I shall not repeat his words here.

Note: ES 5 does not optimize tail calls.

http://www.2ality.com/2015/06/tail-call-optimization.html

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