Javascript Push Object To Array Without Duplicates

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35 Object With Array Javascript Javascript Overflow

51 I found a lot of related questions with answers talking about for in loops and using hasOwnProperty but nothing I do works properly All I want to do is check whether or not a key exists in an array and if not add it I start with an empty array then add keys as the page is scrubbed with jQuery Approach 2: Reducer with object-mutation. The larger your input array, the more performance gain you'll have from the second approach. In my benchmark (for an input array of length 500 - with a duplicate element probability of 0.5), the second approach is ~440 x as fast as the first approach.

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Javascript Push Object To Array Without Duplicatesindex.js const arr = ['bobby', 'hadz', 'com']; const values = ['bobby', 'com', 'a', 'b', 'c']; values.forEach(value => { if (!arr.includes(value)) { arr.push(value); } }); console.log(arr); The function we passed to the Array.forEach method gets called with each element in the array. 5 Answers Sorted by 4 I like the class based approach using es6 The example uses lodash s isEqual method to determine equality of objects

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