| changeset 331 | e3878cdd38bc |
| parent 244 | a359976a6f3e |
| 330:c3d3461a5e77 | 331:e3878cdd38bc |
|---|---|
1 import CW8a._ |
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1 |
2 |
2 val f = (x:(Int, Int)) => if (x._1 > 3) Some(List(x)) else None |
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3 |
3 |
4 assert(first(List((1,0),(2,0),(3,0),(4,0)), f) == Some(List((4,0)))) |
4 val f_urban = (x:(Int, Int)) => if (x._1 > 3) Some(List(x)) else None |
5 assert(first(List((1,0),(2,0),(3,0)), f) == None) |
5 |
6 assert(first(List((1,0),(2,0),(3,0),(4,0)), f_urban) == Some(List((4,0)))) |
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7 assert(first(List((1,0),(2,0),(3,0)), f_urban) == None) |