# compareFormatVersions

> Compares two "M.m" versions as two integers ("2.10" > "2.9"). Returns a negative, zero or positive number.

> **compareFormatVersions**(`a`, `b`): `number`

Compares two `"M.m"` versions as two integers (`"2.10"` > `"2.9"`).
Returns a negative, zero or positive number.

## Parameters

### a

`string`

### b

`string`

## Returns

`number`

## Throws

If either value is not a valid `"M.m"` string.