The minimum element is found!

Why the initial value of the loop variable is set to currentIndex + 1? This is necessary to look for the minimum value after the element with position currentIndex.

var currentIndex = 0;
// Look for the minimum element starting from second position
// [4, 2, 1, 3]

var currentIndex = 1;
// Look for the minimum element starting from third position
// [4, 2, 1, 3]

How to find the minimum element located after the first one?

1. Add variable minValue to store the minimum value.
2. Suppose that the first element is the minumum one. Therefore, let’s store the value of the first element in minValue before the loop.
3. At each iteration of the loop, we compare the current element with minValue value.
4. If the current element is less than minValue, then write it in minValue.

If the first element was the minimum one, then value minValue in the loop will not change. If after the first element there were elements with a lesser value, this value will be written in minValue in the loop.

In any case, the minimum element will be found.

Please note, that this algorithm will not work for empty arrays. In order for the algorithm to work, we need at least one element to denote it as the minimum element before the loop begins.