Selection Sort (JavaScript) sort array by Asc/Desc

selectionSort.js

const arr = [2, 12, -100, -15, -2];

/**
 * Selection sort is a sorting algorithm that selects the smallest element from an unsorted list in each iteration
 * and places that element at the beginning of the unsorted list.
 * @param {*} arr 
 * @returns Array sorted.
 * Uses:
 * 1. checking of all the elements is compulsory.
 * 2. cost of swapping does not matter.
 * 3. a small list is to be sorted.
 */
function selectionSort(arr) {
    for (let i = 0; i < arr.length - 1; i++) {
        // store minimum index value.
        let minimumIndex = i;
        // To sort in descending order, change > to < in this line.
        // Select the minimum element in each loop.
        for (let j = i + 1; j < arr.length; j++) {
            if (arr[j] < arr[minimumIndex]) minimumIndex = j
        }
        // swap only if both value are not same.
        if (arr[minimumIndex] != arr[i]) {
            console.log('swap')
            // swap the position of two elements.
            // put min at the correct position
            let temp = arr[minimumIndex];
            arr[minimumIndex] = arr[i];
            arr[i] = temp;
        }
    }
    return arr;
}
console.log(selectionSort(arr))