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kotlinlang

Hi, Can anyone explain what "backing field" is, with code sample. I'd appreciate it. 

Sure. <http://kotlinlang.org/docs/reference/properties.html#backing-fields>

The `field` here references the backing field
```
var x: Int
  get() = field
  set(value) { field = value}
```

Not every property has a backing field. For example this one does not need it:
```
val y: Int get() = 3
```

But properties that keep their own state have to have a backing field, and it is only accessible from their getter and setter