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JavaScript logical assignment operators

Category

JavaScript

Type

New or changed feature

Status

Enabled by default (Chrome 85)

Intent stage

Start prototyping

Summary

Adds the logical assignment operators ||=, &&=, and ??= to JavaScript.

Motivation

This rounds out the compound assignment operators to also include logical binary operators. Currently only mathematical and bitwise binary operators are supported. This is an incremental improvement for shipping terser, clearer JS.

Standards & signals

• Specification: https://tc39.es/proposal-logical-assignment/
• Firefox: Shipped/Shipping
• Safari: Shipped/Shipping
• Web developers: No signals
• Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=10372

Docs: https://github.com/tc39/proposal-logical-assignment/blob/master/README.md

Explainers: https://github.com/tc39/proposal-logical-assignment/blob/master/README.md

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