**More Information**
* This is the 15th post in a multipart series.
If you want to read more, see our [series index](/learning-kotlin-introduction)
Our last post covered a lot of the awesome extensions to collections in Kotlin and as someone who comes from .NET and Java I think about writing Lambdas in a specific way.
- val numbers = listOf(1,5,6,8,10)
- val evens = numbers.filter({ num -> num % 2 == 0 })
- println(evens)
In .NET/Java we need a range variable, in the example above it is num which refers to the item in the collection we are working on. Kotlin knows you will always have a range variable, so why not simplify it and make it have a common name it:
- val numbers = listOf(1,5,6,8,10)
- val evens = numbers.filter({ it % 2 == 0 })
- println(evens)
Here we got ride of the num -> start of the lambda and we can just refer to the automatically created range variable it.