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JoseGonzalez321/find-duplicates-in-array-alternative.js

Created May 20, 2019 13:14
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find-duplicates-in-array-alternative.js
// Find duplicates in an array of ints
// IMO, a bit messier/complicated than should be. But it works.
function findDupes(arr) {
var counted = arr.reduce((all, item) => {
all[item] = (all[item] || 0) + 1;
return all;
}, {});
return Object.keys(counted).filter(x => counted[x] > 1).map(x => parseInt(x);
}
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