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| 1 | // requires scalaz for Option to have map and flatmap | |
| 2 | ||
| 3 | def safeDivide(a: Double, b: Double): Option[Double] = b match {
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| 4 | case 0 => None | |
| 5 | case _ => Some(a / b) | |
| 6 | } | |
| 7 | ||
| 8 | - | def example1 = safeDivide(5, 9).map(a => safeDivide(3, a)) |
| 8 | + | def example1 = safeDivide(5, 9).flatMap(a => safeDivide(3, a)) |
| 9 | ||
| 10 | def example2 = for {
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| 11 | a <- safeDivide(5, 9) | |
| 12 | b <- safeDivide(3, a) | |
| 13 | } yield b |
