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Remove duplicates from an array keeping its length same in JavaScript
We have to write a function that takes in an array, removes all duplicates from it and inserts the same number of empty strings at the end.
For example − If we find 4 duplicate values we have to remove then all and insert four empty strings at the end.
Therefore, let’s write the code for this problem −
Example
const arr = [1,2,3,1,2,3,2,2,3,4,5,5,12,1,23,4,1]; const deleteAndInsert = arr => { const creds = arr.reduce((acc, val, ind, array) => { let { count, res } = acc; if(array.lastIndexOf(val) === ind){ res.push(val); }else{ count++; }; return {res, count}; }, { count: 0, res: [] }); const { res, count } = creds; return res.concat(" ".repeat(count).split(" ")); }; console.log(deleteAndInsert(arr));
Output
The output in the console will be −
[ 2, 3, 5, 12, 23, 4, 1, '', '', '', '', '', '', '', '', '', '', '' ]
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