Sorting / sortBy examples

sortBy_examples.scala

/********************
 * sortBy Example 1
 ********************/

case class Person(name: String, age: Int)
val people = List(Person("Julian", 35), Person("David", 25), Person("Linda", 40))

//ascending
people.sortBy(_.age) //List(Person("David", 25), Person("Julian", 35), Person("Linda", 40))

//descending
people.sortBy(-_.age) //List(Person("Linda", 40), Person("Julian", 35), Person("David", 25))

/********************
 * sortBy Example 2
 ********************/

// These ids all have a start char and an ending digit.
val ids = List("a5", "b0", "z0", "c9", "d9", "d0", "d5")

// Create a sort key. The second char is first and the first char second.
ids.sortBy((x: String) => (x.charAt(1), x.charAt(0))) // result = b0, d0, z0, a5, d5, c9, d9