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# AI solution for TypeScript puzzle on BFE.dev

5. implement Pick<T, K>

Here's a possible implementation of `MyPick<T, K>`

:

`type MyPick<T, K extends keyof T> = { [P in K]: T[P]}`

Explanation:

- We use the
`keyof T`

operator to get a union type of all keys in`T`

. - We constrain
`K`

to be a subset of this union type using the`extends`

keyword. - We define a mapped type using the
`in`

keyword, where we iterate over all keys`P`

in`K`

. - For each key
`P`

, we use an index type query`T[P]`

to get the type of the corresponding property in`T`

. - We use this type to define a new property in the resulting type, with the same key
`P`

. The resulting value type is`T[P]`

.

Note that this implementation creates a new type by picking properties from `T`

based on their keys in `K`

. This means that if `K`

is empty, the resulting type will also be empty. Additionally, if any key in `K`

is not a valid key in `T`

, then the resulting type will be an error.