pxt-calliope/olddocs/js/object-disclaimer.md

# Objects disclaimer

Touch Develop docs for the micro:bit.

### 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.
Migrate docs from the other repo 2016-03-26 00:47:20 +01:00			`# Objects disclaimer`

removing hashtags from docs 2016-04-02 01:22:47 +02:00			`Touch Develop docs for the micro:bit.`
Migrate docs from the other repo 2016-03-26 00:47:20 +01:00
			`### 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.`