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## Pick Omit
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### Instructions
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Create two functions which taken an object and a string or array of strings. They should return a new object which:
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- `pick`: contains only those keys which appear in the string or array of strings.
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- `omit`: contains only those keys which do not match the string, or do not appear in the array of strings.
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> Those functions are pure and must not modify the given object
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### Notions
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- [object](https://devdocs.io/javascript/global_objects/object)
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