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Logical Assignment Operators

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For Stage 4

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In a nutshell

Input

Output

a ||= b

a || (a = b)

a &&= b

a && (a = b)

a ??= b

a ?? (a = b)

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NamedEvaluation Landed!

  • Simple to fix in JSC, SM, and V8!

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Checklist

  • ✅ Test262 (/test/language/expressions/logical-assignment/*)
  • ✅ Implementations
    • JSC (96%, test() &&= 1 throws ReferenceError due to legacy += web compat)
    • SM (93%, null[p] &&= 1 evaluates property but should just throw)
    • V8 (93%, test() &&= 1 throws ReferenceError due to legacy += web compat)
  • ✅ PR (#2030)
  • ✴️ Spec Editor Approvals
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✅ Kevin Gibbons

✴️ Jordan Harband

✅ Michael Ficarra

✅ Shu-yu Guo

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Stage 4?