# const vars

Source: https://ref.dm-lang.org/var/const

The const type modifier defines a constant value. This may be useful for centralizing the location of a value that is used repeatedly so that it can be easily configured. It has the advantage over #define macros of obeying the normal scope rules for variables. This means, for example, that a const variable declared inside a proc will not conflict with other variables declared elsewhere.

```dm
mob
    var/const/max_items = 100

    Enter(O)
        if(src.contents.len >= src.max_items)
            return 0
        return ..()
```

This example defines an upper limit on the number of items a mob may carry.

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