Intent to Ship: ECMAScript 2016 Exponentiation operator

[Caitlin Potter]

[FYI +blink-dev]

Contact emails

ca...@igalia.com

Spec

Feature has been merged into ECMA262 specification [1]

Summary

Introduces arithmetic operators `**` and `**=`, which behaves as though Math.pow() were called, using the lefthand-side as the base, and righthand-side as the exponent value.

Implemented in V8 since M51 [2], and has been enabled via the --harmony flag and experimental javascript features flag since roughly a week after implementing.

At the moment, this feature is implemented in a very simple way, without introducing complexity to the compiler backends, with limited constant folding support.

Interoperability and Compatibility Risk

Feature is included in the feature set for ECMAScript 2016, and is implemented by several vendors.

- Shipping in Microsoft Edge [3]

- Implemented in Mozilla FireFox [4]

OWP launch tracking bug

See [5] for launch tracking bug

Entry on the feature dashboard

See [6] for feature dashboard entry

[1] https://tc39.github.io/ecma262/#sec-exp-operator

[2] https://chromium.googlesource.com/v8/v8/+/17c92fe6bb62e11a43ef8c77d26410407a9828b5

[3] https://github.com/Microsoft/ChakraCore/commit/9d7e0e4b17bfa3a87c14da8e96cf96b65cb8dbdb

[4] https://github.com/mozilla/gecko-dev/blob/f893a5d6de5044cd02e8e8cea5409a490f7adf62/js/src/jsversion.h#L40-L45

[5] https://bugs.chromium.org/p/v8/issues/detail?id=3915

[6] https://www.chromestatus.com/features/5461064690958336

[Andreas Rossberg]

LGTM, thanks!

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[Adam Klein]

LGTM2