Function isUdfOrNul

Verify the validity of a value.

Usage:

import { isUdfOrNul } from "mazey";

const ret1 = isUdfOrNul(undefined);
const ret2 = isUdfOrNul(null);
const ret3 = isUdfOrNul("abc");
console.log(ret1, ret2, ret3);
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Output:

true true false
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