By taking advantage of the Array.indexOf method, we can easily check whether an element already exists in the new array that we want to create and add it only if it’s not already present. In conclusion, using Array.filter is a simple and effective way of removing duplicate elements from a Javascript array. Therefore, we can safely assume that we are looking at the first occurrence of the item value in the array, and we can add it to the new array that we want to create.įinally, we log the result array to the console, which should contain only the unique elements from the original data array. If it is, the index returned by the Array.indexOf method will be equal to the index argument passed to the callback function. In the callback function, we use the Array.indexOf method to check whether the current value item is the first occurrence in the array. We then use the Array.filter method and pass a callback function that takes two arguments: the current value item and the current index index. In this example, we define a new constant called data that contains an array of values, some of which are duplicated. Check the MDN documentation about Array.filter and Array.indexOf for more information. In this tutorial, learn the top 5 ways to remove duplicate objects strings from an array in javascript, Filter primitive ES6 Set with spread operator,lodash underscore uniq, array reduce, some with ES6 what is the fastest way to remove elements in terms of performance execution time in.
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