## How to Efficiently Find Common Elements Across Multiple JavaScript Arrays?

Finding Common Elements Among Multiple JavaScript Arrays

In JavaScript, comparing arrays for matching elements and retrieving only the common values is a frequently encountered task. Consider the following challenge: given multiple arrays with string values, find and display the elements that are identical in all of them.

To achieve this, we can leverage the concept of functional programming in JavaScript. Here's how you can accomplish this efficiently without using external libraries:

var result = arrays.shift().filter(function(v) {
    return arrays.every(function(a) {
        return a.indexOf(v) !== -1;
    });
});

This code takes advantage of the filter() method, which creates a new array with elements that pass a given condition. The condition here is that each element should be present in every array. The every() method ensures this by checking if all arrays include the element being evaluated.

For example, given the following arrays:

var arr1 = ['apple', 'orange', 'banana', 'pear', 'fish', 'pancake', 'taco', 'pizza'];
var arr2 = ['taco', 'fish', 'apple', 'pizza'];
var arr3 = ['banana', 'pizza', 'fish', 'apple'];

The result will be:

['apple', 'fish', 'pizza']

This solution is relatively concise and handles arrays of various lengths without introducing any duplicates. It's important to note that the arrays should be sorted in ascending order for optimal performance.

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