If it did, the value is not present in the array, so we use the push() method. The if statement checks if the indexOf method returned -1. If the value is not contained in the array, the method returns -1. We'll dive deeper into existential questions of equality and truth in part 2. The Array.indexOf method returns the index of the first occurrence of the supplied value in the array. We've been taking for granted that the functions we've been using have implicit tests of equality that may not necessarily match what we expect from what "equality" means between array elements. reduce() Using the Setobject is fantastic for straightforward use cases. Remove Duplicate Objects from an Array Using. Speaking of assumptions, we've been talking about deduplication but neglecting to consider the elephant in the room: what does it mean for something to be a duplicate of another? In other words: what makes something different from another? Use cases requiring an array of unique objects or arrays is best achieved using some combination of. One would have assumed that deduplication is such a simple task that it's such a surprise not to get the expected answer. Now we get something different, but still is definitely not what we can consider as the "correct" result. Object.keys(arr.reduce((acc, cur) => (acc = cur & acc), ) => arr.filter((e) => !(t = e in t)) UsingFilter: (arr) => arr.filter((e, i, a) => a.indexOf(e) = i),
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