It is not called nullish collision but nullish coalescing assignment. And this userProfile &&= value does exact opposite than you described. If userProfile has falsy value, then it keeps it, if not, then the value is overwritten by value.
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nullish collisionbutnullish coalescingassignment. And thisuserProfile &&= valuedoes exact opposite than you described. IfuserProfilehas falsy value, then it keeps it, if not, then the value is overwritten byvalue.