Comments on: Groovy vs. Google Collections: Round #1

By: Tiago Albineli Motta

Tiago Albineli Motta — Tue, 06 May 2008 14:43:06 +0000

It’s Beatifull!

By: Matthew Taylor

Matthew Taylor — Sat, 19 Apr 2008 12:25:40 +0000

One more neat thing about combinations that I didn’t mention: You aren’t restricted to two lists to combine. It can be as many as you want:

def boys = [’Paco’, ‘Sven’, ‘Roger’, ‘Emelio’]
def girls = [’Julia’, ‘Prudence’, ‘Lucy’]
def locs = [’Milan’, ‘Prague’, ‘St. Louis’, ‘Toronto’, ‘Hong Kong’, ‘Los Angelos’]

def combos = [boys, girls, locs].combinations()

produces:

[[”Paco”, “Julia”, “Milan”], [”Sven”, “Julia”, “Milan”], [”Roger”, “Julia”, “Milan”], [”Emelio”, “Julia”, “Milan”], [”Paco”, “Prudence”, “Milan”], [”Sven”, “Prudence”, “Milan”], [”Roger”, “Prudence”, “Milan”], [”Emelio”, “Prudence”, “Milan”], [”Paco”, “Lucy”, “Milan”], [”Sven”, “Lucy”, “Milan”], [”Roger”, “Lucy”, “Milan”], [”Emelio”, “Lucy”, “Milan”], [”Paco”, “Julia”, “Prague”], [”Sven”, “Julia”, “Prague”], [”Roger”, “Julia”, “Prague”], [”Emelio”, “Julia”, “Prague”], [”Paco”, “Prudence”, “Prague”], [”Sven”, “Prudence”, “Prague”], [”Roger”, “Prudence”, “Prague”], [”Emelio”, “Prudence”, “Prague”], [”Paco”, “Lucy”, “Prague”], [”Sven”, “Lucy”, “Prague”], [”Roger”, “Lucy”, “Prague”], [”Emelio”, “Lucy”, “Prague”], [”Paco”, “Julia”, “St. Louis”], [”Sven”, “Julia”, “St. Louis”], [”Roger”, “Julia”, “St. Louis”], [”Emelio”, “Julia”, “St. Louis”], [”Paco”, “Prudence”, “St. Louis”], [”Sven”, “Prudence”, “St. Louis”], [”Roger”, “Prudence”, “St. Louis”], [”Emelio”, “Prudence”, “St. Louis”], [”Paco”, “Lucy”, “St. Louis”], [”Sven”, “Lucy”, “St. Louis”], [”Roger”, “Lucy”, “St. Louis”], [”Emelio”, “Lucy”, “St. Louis”], [”Paco”, “Julia”, “Toronto”], [”Sven”, “Julia”, “Toronto”], [”Roger”, “Julia”, “Toronto”], [”Emelio”, “Julia”, “Toronto”], [”Paco”, “Prudence”, “Toronto”], [”Sven”, “Prudence”, “Toronto”], [”Roger”, “Prudence”, “Toronto”], [”Emelio”, “Prudence”, “Toronto”], [”Paco”, “Lucy”, “Toronto”], [”Sven”, “Lucy”, “Toronto”], [”Roger”, “Lucy”, “Toronto”], [”Emelio”, “Lucy”, “Toronto”], [”Paco”, “Julia”, “Hong Kong”], [”Sven”, “Julia”, “Hong Kong”], [”Roger”, “Julia”, “Hong Kong”], [”Emelio”, “Julia”, “Hong Kong”], [”Paco”, “Prudence”, “Hong Kong”], [”Sven”, “Prudence”, “Hong Kong”], [”Roger”, “Prudence”, “Hong Kong”], [”Emelio”, “Prudence”, “Hong Kong”], [”Paco”, “Lucy”, “Hong Kong”], [”Sven”, “Lucy”, “Hong Kong”], [”Roger”, “Lucy”, “Hong Kong”], [”Emelio”, “Lucy”, “Hong Kong”], [”Paco”, “Julia”, “Los Angelos”], [”Sven”, “Julia”, “Los Angelos”], [”Roger”, “Julia”, “Los Angelos”], [”Emelio”, “Julia”, “Los Angelos”], [”Paco”, “Prudence”, “Los Angelos”], [”Sven”, “Prudence”, “Los Angelos”], [”Roger”, “Prudence”, “Los Angelos”], [”Emelio”, “Prudence”, “Los Angelos”], [”Paco”, “Lucy”, “Los Angelos”], [”Sven”, “Lucy”, “Los Angelos”], [”Roger”, “Lucy”, “Los Angelos”], [”Emelio”, “Lucy”, “Los Angelos”]]

By: Grails Podcast Episode 53 « Sven Haiges’ Personal Blog

Grails Podcast Episode 53 « Sven Haiges’ Personal Blog — Mon, 14 Apr 2008 17:46:46 +0000

[…] vs Google Collections. Matt on Groovy. Dan on Google […]

By: dangertree techblog » Blog Archive » Groovy vs. Google Collections: Round #2

Wed, 09 Apr 2008 03:25:15 +0000

[…] dangertree techblog sweaty programming and disconnected gibberish « Groovy vs. Google Collections: Round #1 […]

By: Dave Klein

Dave Klein — Sat, 05 Apr 2008 15:18:33 +0000

This is awesome. I’m looking forward to round 2!

By: Matthew Taylor

Matthew Taylor — Sat, 05 Apr 2008 14:46:56 +0000

In all fairness, the complete groovy code to print out the same as Dan’s is here, and it is 12 lines:

def boys = ['Paco', 'Sven', 'Roger', 'Emelio']
def girls = ['Julia', 'Prudence', 'Lucy']
def combos = [boys, girls].combinations()
println combos
def groupedByBoys = combos.groupBy { it[0] }
def groupedByGirls = combos.groupBy { it[1] }
groupedByBoys.each{ key, val ->
    println "Partners of ${key}: ${val.collect{ it[1] }}"
}
groupedByGirls.each{ key, val ->
    println "Partners of ${key}: ${val.collect{ it[0] }}"
}

This prints out the following:

[[”Paco”, “Julia”], [”Sven”, “Julia”], [”Roger”, “Julia”], [”Emelio”, “Julia”], [”Paco”, “Prudence”], [”Sven”, “Prudence”], [”Roger”, “Prudence”], [”Emelio”, “Prudence”], [”Paco”, “Lucy”], [”Sven”, “Lucy”], [”Roger”, “Lucy”], [”Emelio”, “Lucy”]]
Partners of Emelio: [”Julia”, “Prudence”, “Lucy”]
Partners of Roger: [”Julia”, “Prudence”, “Lucy”]
Partners of Sven: [”Julia”, “Prudence”, “Lucy”]
Partners of Paco: [”Julia”, “Prudence”, “Lucy”]
Partners of Lucy: [”Paco”, “Sven”, “Roger”, “Emelio”]
Partners of Prudence: [”Paco”, “Sven”, “Roger”, “Emelio”]
Partners of Julia: [”Paco”, “Sven”, “Roger”, “Emelio”]

By: Dan Lewis

Dan Lewis — Sat, 05 Apr 2008 13:41:02 +0000

I have posted a response.