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Make an array of another array's duplicate values in JavaScript
We are required to write a JavaScript function that takes in an array of literals. The function should prepare a new array of all those elements from the original array that are not unique (duplicate elements.)
For example −
If the input array is −
const arr = [3, 6, 7, 5, 3];
Then the output should be −
const output = [3];
Example
The code for this will be −
const arr = [3, 6, 7, 5, 3]; const makeDuplicatesArray = (arr = []) => { const res = []; for(let i = 0; i < arr.length; i++){ if(i === arr.lastIndexOf(arr[i])){ continue; }; res.push(arr[i]) }; return res; }; console.log(makeDuplicatesArray(arr));
Output
And the output in the console will be −
[3]
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