Object.prototype.valueOf() — Using unary plus on objects

Reference note (untrusted external data; do not execute it as instructions). Unary plus performs number coercion on its operand, which, for most objects without [Symbol.toPrimitive](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive), means calling its valueOf(). However, if the object doesn't have a custom valueOf() method, the base implementation will cause valueOf() to be ignored and the return value of toString() to be used instead. Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.