For filtering duplicates in array of custom objects Array. : Sure, Set() will do the trick for primitve values, with objects a non O(n^2) solution would be first performing a sort() on the array(which operates in O(nlogn)), and then search for the adjacents equal items(which is O(n)), so you got O(n + : Also, om(new Set()), but this only works on primitives. In conclusion, removing duplicates from an array in JavaScript can be done differently. If it isn’t, it is added to the new array. Then we use the reduce() method and pass in a callback function that checks if the current element is already in the new array. Object.keys(array.reduce((map, next) => ()) In the example above, we first create an array with duplicates. It takes two parameters: an Array and a lambda. # Community : array.includes(item) is more idiomatic way of testing whether array contains the : Just today I did this by doing the following. The distinctBy function is useful when you need to remove duplicate items from an Array. includes (item ) ? unique : }, ) // □ The initial value of our Accumulator is an empty array // RESULT: // Īnd here's the output from the console.log: Item The logic of using double loops to deduplicate is very simple, but the time complexity of the code is high. includes (item ) ? unique :, ) return unique. Condition (Remember it only get pushed if this returns `false`)
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