JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [1,5,2,3,8,13, 1];
var arr2 = arr.map(function(o, i) {return {idx: i, obj: o}; }).sort(function(a, b) {
    console.log('a.idx:', a.idx, 'b.idx:', b.idx);
    return a.obj - b.obj;
});

for(var i = 0, j = arr2.length; i < j; i++){
    console.log('i:', i, 'arr2[i].obj:', arr2[i].obj);
}