Conquer the JavaScript Interview: Array Duplicates [Beginner Skill Level]

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This is a part of my Algorithms and Data Structures playlist series. We cover a lot of common interview questions asked during whiteboards for entry level developers. Learning to master these takes time, practice, and pattern recognition. So I'll be helping you equip a toolbelt and filling it with as many tools as I can to help prepare you crush those interviews! Remember: "Luck is where practice meets opportunity."

In this video we cover how to remove duplicate elements from an array of values. This particular algorithm can be solved a number of different ways, which we cover at least 4 solutions here. We leverage the Set data structure to very easily solve it, but admit it's more of a meme answer than one you'd prolly do in a real interview. A double for loop solution which works, but is not performative. Utilizing the indexOf array method as a shorthand of the previous double for loop solutions. And finally the most "logical" way to approach the solution: a for loop and an object (or Map object ;)) to track what values we've seen in the input array before adding them to our output array.

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#algorithms #javascript #interview #interviewtips