Semantics, [1, 2] and [2, 1] have the same entries but aren't the same arrays.
You're right, if you wanted to know if they have the same entries in the same order you wouldn't sort them.
It's just creating two JSON strings and compares them, all of JSONs limitations (not only undefined or null but also Infinite, NaN, functions, symbols and such) apply. Shouldn't have to mention it as should be fairly obvious.
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Why do sort though? Those are not the same arrays
[1, 2],[2, 1].Semantics,
[1, 2]and[2, 1]have the same entries but aren't the same arrays.You're right, if you wanted to know if they have the same entries in the same order you wouldn't sort them.
JSON.stringify([undefined]) === JSON.stringify([null])It's just creating two JSON strings and compares them, all of JSONs limitations (not only
undefinedornullbut alsoInfinite,NaN, functions, symbols and such) apply. Shouldn't have to mention it as should be fairly obvious.