# isinf proc

Source: https://ref.dm-lang.org/proc/isinf
Added in BYOND 515.

### Format
> `isinf(n)`

### Args
> n: A number

### Returns
> 1 if this is an infinite numeric value, either positive or negative; 0 otherwise

### See also
- [isnum proc](https://ref.dm-lang.org/proc/isnum.md)
- [isnan proc](https://ref.dm-lang.org/proc/isnan.md)
- [Numbers](https://ref.dm-lang.org/notes/numbers.md)