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kotlinlang

I have this map:

private val listOfFeeds : Map&lt;String, String&gt;

If I try to access an element with
val s = listOfFeeds[key]

The return type of "s" is String? And not String.
I guess that's because the compiler can't assume it'll get a value for that key. Right?
And if so, how can I work around the problem? Is !! the only solution here?

Do a null check:
```
val s = listOfFeeds[key]
if (s == null) {
  // code for null
} else {
  // code for non-null
}
```
Alternatively you can use `map.getOrDefault(key, defaultValue)`. Or, if you are really sure that it's not null you can use `!!` or `checkNotNull(map[key])`

```val s: String
someMap["foo"]?.let { s = it } ?: throw```

the `[]` indexing operator is just calling `get` which return a Nullable because the key might not exists
you can use a fallback values with `?:` or throw in that case
i like to use `?.let { doSomethingWith(it)}` personally
andyou could also just use `!!` to null assert