How to Find Elements Present in All JavaScript Arrays?

Identifying Identical Matches Across Multiple JavaScript Arrays

In the realm of JavaScript development, the need often arises to compare arrays and retrieve matching elements. However, when dealing with multiple arrays, finding matches that exist in all arrays can present a challenge.

One approach, as mentioned in the question, involves creating a new array by concatenating all the input arrays. While this method gives a comprehensive list, it also includes duplicates. To refine this approach, we can utilize the .filter method to isolate matches.

The provided answer employs a clever strategy that shifts the first array in the given array list and applies the .filter method. For each element in the shifted array, it checks if it exists in all the remaining arrays using the .every method. Elements that satisfy this condition are added to the result array.

By shifting arrays and continuously applying this check, the function effectively filters out elements that are not present in all the input arrays. This approach is elegant and efficient, providing the desired output.

However, it's worth noting that the solution presented assumes that the input arrays do not contain duplicates. If this is not the case, an alternative approach using .reduce can be employed to handle duplicates while maintaining the same functionality.

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