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dictionary counter solution in Clear category for [old] Non-unique Elements by ZoltanOnody
"use strict";
const nonUniqueElements = (data) => {
let counter = {};
for(let val of data){
counter[val] = (counter[val] || 0) + 1;
}
return data.filter(val => counter[val] > 1);
}
July 20, 2016
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