console.log(null || undefined)
console.log(undefined || null)
console.log(null ?? "foo")
console.log(undefined ?? "foo")
console.log((null || undefined) ?? "foo")
console.log(null || undefined)
console.log(undefined || null)
console.log(null ?? "foo")
console.log(undefined ?? "foo")
console.log((null || undefined) ?? "foo")