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find duplicates array javascript

let arr = [1, 7, 8, 9, 10, 20, 33, 0, 20, 7, 1]
console.log([... new Set(arr)]
// Output : [1, 7, 8, 9, 10, 20, 33, 0]
Source by gist.github.com #
 
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Tagged: #find #duplicates #array #javascript
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