# Kotlin Coding Guidelines

## Code structure

- short methods (not too long)
  - add suggestion how to refactor

- only one level of abstraction
  keep only one abstraction level in method  

- keep low level of identation
  less is more 
  for example when() if-else if-else is not very good redable

- use variable for expression / condition


## Questions

### `value.?let` or `if (value != null)`

Is really better to use

```kotlin
value?.let {
     // some block
}
```

then

```kotlin
if (value != null) {
    // some block
}
```

There is no return value so block is NOT expression.

### Don't use anonymous class implementation
```kotlin
val value = object : Type {
    // implementation
}
```