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The bitwise OR operator results in a 32-bit integer where each bit in the numbers being ORed is set to 1 if either of the corresponding bits are set to 1. If either number is different, that resulting bit will be set to 0.
console.log(2 | 2); // 2
console.log(2 | 3); // 3
console.log(2 | 4); // 6