# len var (vector)

Source: https://ref.dm-lang.org/vector/var/len
Added in BYOND 516.

The dimensionality (number of components) of this vector. Can be 2 or 3. This value can be changed.

Most math operations on a vector will expand the result to the same dimension as the largest operand.

### See also
- [length proc](https://ref.dm-lang.org/proc/length.md)
- [vector](https://ref.dm-lang.org/vector/index.md)
- [vars (vector)](https://ref.dm-lang.org/vector/var/index.md)