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.concat() ↔ to return new merged Array

!syntax arr1.concat(value0?: any ..., valueN?: any): array

References​

  1. use. [**_.concat()_**](concat) to merge 2 arrays ↔ const arr3 = arr1.concat(arr2)

  2. use [**_.concat()_**](concat) to return [shallow copy](shallow-copy) ↔ const arrCopy = arr.concat()

  3. !equivalent to [.reduce()](reduce_array-instance-methods) + [**_.concat()_**](concat) ↔ arr.reduce((acc, val) ⇒ acc.concat(val), [])