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Search a list of records: Difference between revisions
Scala solution added
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</lang>
=={{header|Scala}}==
<lang Scala>object SearchListOfRecords extends App {
val cities = Vector(
City("Lagos", 21.0e6),
City("Cairo", 15.2e6),
City("Kinshasa-Brazzaville", 11.3e6),
City("Greater Johannesburg", 7.55e6),
City("Mogadishu", 5.85e6),
City("Khartoum-Omdurman", 4.98e6),
City("Dar Es Salaam", 4.7e6),
City("Alexandria", 4.58e6),
City("Abidjan", 4.4e6),
City("Casablanca", 3.98e6)
)
def index = cities.indexWhere((_: City).name == "Dar Es Salaam")
def name = cities.find(_.pop < 5.0e6).map(_.name)
def pop = cities.find(_.name(0) == 'A').map(_.pop)
case class City(name: String, pop: Double)
println(
s"Index of first city whose name is 'Dar Es Salaam' = $index\n" +
s"Name of first city whose population is less than 5 million = ${name.get}\n" +
f"Population of first city whose name starts with 'A' = ${pop.get}%,.0f")
}</lang>
{{Out}}See it in running in your browser by [https://scalafiddle.io/sf/8OlRzf8/0 ScalaFiddle (JavaScript executed in browser)] or by [https://scastie.scala-lang.org/efKOmJgiQv6Q52h2WXYcig Scastie (remote JVM)].
{{Out}}<pre>Index of first city whose name is 'Dar Es Salaam' = 6
Name of first city whose population is less than 5 million = Khartoum-Omdurman
Population of first city whose name starts with 'A' = 4,580,000
</pre>
=={{header|Scheme}}==
{{libheader|Scheme/SRFIs}}
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