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</lang>

=={{header|Elena}}==

<lang elena>import extensions.

import system'routines.

[

var dataset :=

{ Name = "Casablanca". Population = 3.98r. }

).

var index := dataset selectBy(:r)(r Name); toArray; indexOfElement("Dar Es Salaam").

console printLine(index).

var name := dataset filterBy(:c)(c Population < 5.0r); firstMember; Name.

console printLine(name).

var namePopulation := dataset filterBy(:c)(c Name; startingWith:"A"); firstMember; Population.

{{out}}

<pre>