How to Compute Set Difference Efficiently Using Javascript Arrays?

Efficient Set Difference Computation with Javascript Arrays

In Javascript programming, the set difference between two sets is often required. These sets are represented as Javascript arrays, and there are various methods to compute this difference efficiently or elegantly.

One approach that both fulfills these criteria is to utilize the built-in filter function. By comparing each element x in set A with the set B using the indexOf method, we can determine if x is not present in B. Elements that meet this condition constitute the set difference.

An example illustrating this approach:

<code class="javascript">var A = [1, 2, 3, 4];
var B = [1, 3, 4, 7];

var diff = A.filter(function(x) {
  return B.indexOf(x) < 0;
});

console.log(diff); // [2]</code>

This solution provides a concise and performant method for computing set differences in Javascript, aligning with your request for elegance and speed.

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