pxt-calliope/olddocs/js/object-disclaimer.md
2016-11-01 17:44:37 -07:00

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# Objects disclaimer
Touch Develop docs for the @boardname@.
### Memory management on the micro-bit
New user-defined object types are allocated on the heap and are ref-counted. Our ref-counting algorithm does *not* have a cycle collector. (See Wikipedia.)
### Practical consequences
This means that the following script will result in an out-of-memory error.
![](/static/mb/object-disclaimer-0.png)
```
while (true) {
let l = new List()
l.next = l
}
```
### How to avoid this?
Don't do it. It's bad.