Question

How to rearrange an array and set arr[i] to i in JavaScript

Answer 1

function ArrayRearrange(arr) {
    const size = arr.length;
    
    for (let i = 0; i < size ; ) {
        if (arr[i] >= 0 && arr[i] != i) {
            [arr[arr[i]], arr[i]] = [arr[i], arr[arr[i]]];
        }
        else {
            i++;
        }
    }
}
        
let arr = [9, 0, 4, 2, 7, 6, 8, 3, 1, 5];

ArrayRearrange(arr);

for (let i = 0; i < arr.length; i++) {
    console.log(arr[i]);
}



/*
run:

0
1
2
3
4
5
6
7
8
9

*/

 

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