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Logs all duplicate numbers in an array.
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| // Log all duplicate numbers in an array. | |
| const arr = [1,3,2,5,6,7,3,3,1,4,4] | |
| const logDuplicates = arr => { | |
| const results = [] | |
| arr.map(num => { | |
| const dupe = arr.filter(i => i === num).length > 1 | |
| if (dupe === true && !results.includes(num)) { | |
| results.push(num) | |
| } | |
| }) | |
| return results | |
| } | |
| console.log(logDuplicates(arr)) |
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