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POAn efficient Javascript set structure
 

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    <p>After reading many similar questions:</p> <ul> <li><a href="https://stackoverflow.com/questions/2523436/javascript-implementation-of-a-set-data-structure">JavaScript implementation of a set data structure</a></li> <li><a href="https://stackoverflow.com/questions/7958292/mimicking-sets-in-javascript">Mimicking sets in JavaScript?</a></li> <li><a href="https://stackoverflow.com/questions/12204472/node-js-traditional-data-structures-such-as-set-etc-anything-like-java-uti">Node JS, traditional data structures? (such as Set, etc), anything like Java.util for node?</a></li> <li><a href="https://stackoverflow.com/questions/15555656/efficient-javascript-array-lookup">Efficient Javascript Array Lookup</a></li> <li><a href="https://stackoverflow.com/questions/143847/best-way-to-find-an-item-in-a-javascript-array">Best way to find if an item is in a JavaScript array?</a></li> <li><a href="https://stackoverflow.com/questions/237104/array-containsobj-in-javascript">How do I check if an array includes an object in JavaScript?</a></li> </ul> <p>I still have a question: suppose I have a large array of strings (several thousands), and I have to make many lookups (i.e. check many times whether a given string is contained in this array). What is the most <em>efficient</em> way to do this in Node.js ?</p> <p>A. Sort the array of strings, then use binary search? or:</p> <p>B. Convert the strings to keys of an object, then use the "in" operator</p> <p>?</p> <p>I know that the complexity of A is O(log N), where N is the number of strings.</p> <p>But I don't know the complexity of B.</p> <p>IF a Javascript object is implemented as a hash table, then the complexity of B is, on average, O(1), which is better than A. However, I don't know if a Javascript object is really implemented as a hash table!</p>
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    1. COan object property lookup will be almost instant in V8, and there is no binary search. you can use [].filter(/./.test, /^bob$/i) to find string elements of "bob", which is faster than user-land search code...
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    2. CO@apsillers I edited my question to make it clear that I am interested mainly in the Node.JS implementation.
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    3. CO@dandavis I'm almost certain that a simple `Array.indexOf()` is faster then that.
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