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kotlinlang

``` request.session().attribute('flash')[key] = [requests: 1, value: value]```

i don't know groovy, but if this is spark, `attribute(key)` will get a session attribute (which can be whatever). in this case it seems to be a map&lt;key, pair&gt;

think of it like this:
```
val map = request.session().attribute('flash');
map[key] = [requests: 1, value: value]
```

so the code just updates a custom-attribute called "flash".. if you're not using this, you can remove the line

It's the map&lt;key,pair&gt; that's been really confusing me. With all of groovy's magic typing, I couldn't work out what the types were.

I've been trying to build a flash scope in kotlin-spark