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Asked: 2026-05-21T16:01:31+00:00

There are many cases in which JavaScript’s type-coercing equality operator is not transitive. For

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There are many cases in which JavaScript’s type-coercing equality operator is not transitive. For example, see “JavaScript equality transitivity is weird.”

However, are there any cases in which == isn’t symmetric? That is, where a == b is true and b == a is false?

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1 Answer

  1. Editorial Team

    In Javascript, == is always symmetric.

    The spec says:

    NOTE 2 The equality operators
    maintain the following invariants:

    • A != B is equivalent to !(A == B).
    • A == B is equivalent to B == A, except in the order of evaluation of
      A and B.
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