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shallow copy ↔ one level deep in a cloned Array/Object

References​

  1. Object.assign() ↔ Object Static Method to merge 2 objects into shallow copy

  2. .slice() ↔ Array Instance Method to return newshallow copy portion of Array

  3. use [.concat()](concat) to return [**_shallow copy_**](shallow-copy) ↔ const arrCopy = arr.concat()