# Broken interface of Math.min

In an article about creating a column layout I found the following two lines of code:

```
var min = Array.min(blocks);
var index = $.inArray(min, blocks);
```

This first finds the minimum value in `blocks`

and then the `index`

of that
value. This combination of lines is very strange. `Array.min`

already knows the
index of the minimum element and throws it away. Then the programmer needs to
find the index again with a linear search.

This means the interface of `Array.min`

is incomplete. A more general version
would return the index of the value in the array that is minimal. This can't be
written on top of the `Array.min`

function in a efficient manner.

The following is a function that returns the index of the minimum element in elements.

```
// elements is a non-empty array
function min_index(elements) {
var i = 1;
var mi = 0;
while (i < elements.length) {
if (elements[i] < elements[mi])
mi = i;
i += 1;
}
return mi;
}
```

The corresponding `max_index`

looks like this:

```
// elements is a non-empty array
function max_index(elements) {
var i = 1;
var mi = 0;
while (i < elements.length) {
if (!(elements[i] < elements[mi]))
mi = i;
i += 1;
}
return mi;
}
```