### `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
}
```