60. implement UndefinedToNull<T>
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- accepted / - tried
Following the coding question 176. undefined to null on BFE.dev,
please implement UndefinedToNull<T>
.
type A = UndefinedToNull<string> // string
type B = UndefinedToNull<undefined> // null
type C = UndefinedToNull<[undefined, null]> // [null, null]
type D = UndefinedToNull<{
a: undefined,
b: [1, undefined]
}> // {a: null, b: [1, null]}