Find duplicate nos in array using hash tables

HashTable.md

//hash tables are used to iterate over an array using a key to compute the array index, instead of using the key as an array index

//for this function i is used as a key to loop through the array

const showDuplicateNo = (array) => { let hashTable = []; let duplicateNo = [];

for (let i = 0; i < array.length; i++) { if (hashTable[array[i].toString()] === undefined) { hashTable[array[i].toString()] = true; }

else { duplicateNo.push(array[i]); }

}

return duplicateNo; }

console.log(showDuplicateNo([2,8,2,8,10,4]))