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Special type of sorting algorithm in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the only argument.
The function should sort the array based on the following conditions −
All even numbers are sorted in increasing order
All odd numbers are sorted in decreasing order
The relative positions of the even and odd numbers remain the same
For example −
If the input array is −
const arr = [12, 17, 15, 24, 1, 6];
Then the output should be −
const output = [6, 17, 15, 12, 1, 24];
Example
Following is the code −
const arr = [12, 17, 15, 24, 1, 6]; const specialSort = (nums = []) => { const oddArr = [], evenArr = []; for (let i = 0; i < nums.length; i++){ if (nums[i] & 1) { oddArr.push(i); } else { evenArr.push(i); } } nums.sort((a, b) => a - b); let odd = oddArr.length - 1, even = 0; const res = []; for (let i = 0; i < nums.length; i++){ if (nums[i] & 1) { res[oddArr[odd--]] = nums[i]; } else { res[evenArr[even++]] = nums[i]; } } return res; }
Output
Following is the console output −
[ 6, 17, 15, 12, 1, 24 ]
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