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ELENA 3.4.x :

<lang elena>import extensions.;

import system'routines.;

public program()

var dataset := new object[]

({

new : { Name = "Lagos".; Population = 21.0r.; },

new : { Name = "Cairo".; Population = 15.2r.; },

new : { Name = "Kinshasa-Brazzaville".; Population = 11.3r.; },

new : { Name = "Greater Johannesburg".; Population = 7.55r.; },

new : { Name = "Mogadishu".; Population = 5.85r.; },

new : { Name = "Khartoum-Omdurman".; Population = 4.98r.; },

new : { Name = "Dar Es Salaam".; Population = 4.7r.; },

new : { Name = "Alexandria".; Population = 4.58r.; },

new : { Name = "Abidjan".; Population = 4.4r.; },

new : { Name = "LagosCasablanca".; Population = 21.0r3.98r; },

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

console .printLine(index).;

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

console .printLine(name).;

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

console .printLine(namePopulation)

]}</lang>