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#If we don't have to modify in place, but rather return the new playlist, this can be shortened to: | |
def skip_tracks(a,i) o=i%a.size; o==0 ? a : a[o..-1]+a[0..o-1] end |
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def skip_tracks(arr,i) | |
start=inc=i%arr.size | |
count=1 | |
while inc > 0 && count < arr.size() do | |
c=start | |
count=count+1 | |
begin | |
before=(c-inc) % arr.size | |
arr[before],arr[c]=arr[c],arr[before] | |
count=count+1 | |
c=(c+inc) % arr.size | |
end while (c+inc) % arr.size != start | |
start=start-1 | |
end | |
arr | |
end |
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#!/usr/bin/env ruby | |
require 'rubygems' | |
require 'spec' | |
require 'ruby_magnets.rb' | |
PLAYLIST0=["track1", "track2", "track3", "track4", "track5", "track6", "track7"] | |
PLAYLIST1=["track2", "track3", "track4", "track5", "track6", "track7", "track1"] | |
PLAYLIST2=["track3", "track4", "track5", "track6", "track7", "track1", "track2"] | |
PLAYLIST3=["track4", "track5", "track6", "track7", "track1", "track2", "track3"] | |
PLAYLIST4=["track5", "track6", "track7", "track1", "track2", "track3", "track4"] | |
PLAYLIST5=["track6", "track7", "track1", "track2", "track3", "track4", "track5"] | |
PLAYLIST6=["track7", "track1", "track2", "track3", "track4", "track5", "track6"] | |
describe Object do | |
before(:each) do | |
@playlist=PLAYLIST0.dup | |
end | |
it 'should move the first track to the end with #skip_tracks(playlist,1)' do | |
skip_tracks(@playlist,1) | |
@playlist.should == PLAYLIST1 | |
end | |
it 'should move the last track to the first with #skip_tracks(playlist,-1)' do | |
skip_tracks(@playlist,-1) | |
@playlist.should == PLAYLIST6 | |
end | |
it 'should move the first two tracks to the end with #skip_tracks(playlist,2)' do | |
skip_tracks(@playlist,2) | |
@playlist.should == PLAYLIST2 | |
end | |
it 'should move the last two tracks to the start with #skip_tracks(playlist,-2)' do | |
skip_tracks(@playlist,-2) | |
@playlist.should == PLAYLIST5 | |
end | |
it 'should move the first three tracks to the end with #skip_tracks(playlist,3)' do | |
skip_tracks(@playlist,3) | |
@playlist.should == PLAYLIST3 | |
end | |
it 'should move the last three tracks to the start with #skip_tracks(playlist,-3)' do | |
skip_tracks(@playlist,-3) | |
@playlist.should == PLAYLIST4 | |
end | |
it 'should move the first four tracks to the end with #skip_tracks(playlist,3)' do | |
skip_tracks(@playlist,4) | |
@playlist.should == PLAYLIST4 | |
end | |
it 'should move the last four tracks to the start with #skip_tracks(playlist,-3)' do | |
skip_tracks(@playlist,-4) | |
@playlist.should == PLAYLIST3 | |
end | |
it 'should move the first track to the end with #skip_tracks(playlist,8)' do | |
skip_tracks(@playlist,8) | |
@playlist.should == PLAYLIST1 | |
end | |
it 'should move the last track to the start with #skip_tracks(playlist,-8)' do | |
skip_tracks(@playlist,-8) | |
@playlist.should == PLAYLIST6 | |
end | |
end |
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def skip_tracks(a,i) o=i%a.size; a.replace(a[o..-1]+a[0..o-1]) if o; end |
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#!/usr/bin/env ruby | |
require 'rubygems' | |
require 'spec' | |
require 'skip_tracks_favourite.rb' | |
PLAYLIST0=["track1", "track2", "track3", "track4", "track5", "track6", "track7"] | |
PLAYLIST1=["track2", "track3", "track4", "track5", "track6", "track7", "track1"] | |
PLAYLIST2=["track3", "track4", "track5", "track6", "track7", "track1", "track2"] | |
PLAYLIST3=["track4", "track5", "track6", "track7", "track1", "track2", "track3"] | |
PLAYLIST4=["track5", "track6", "track7", "track1", "track2", "track3", "track4"] | |
PLAYLIST5=["track6", "track7", "track1", "track2", "track3", "track4", "track5"] | |
PLAYLIST6=["track7", "track1", "track2", "track3", "track4", "track5", "track6"] | |
describe Object do | |
before(:each) do | |
@playlist=PLAYLIST0.dup | |
end | |
it 'should move the first track to the end with #skip_tracks(playlist,1)' do | |
skip_tracks(@playlist,1) | |
@playlist.should == PLAYLIST1 | |
end | |
it 'should move the last track to the first with #skip_tracks(playlist,-1)' do | |
skip_tracks(@playlist,-1) | |
@playlist.should == PLAYLIST6 | |
end | |
it 'should move the first two tracks to the end with #skip_tracks(playlist,2)' do | |
skip_tracks(@playlist,2) | |
@playlist.should == PLAYLIST2 | |
end | |
it 'should move the last two tracks to the start with #skip_tracks(playlist,-2)' do | |
skip_tracks(@playlist,-2) | |
@playlist.should == PLAYLIST5 | |
end | |
it 'should move the first three tracks to the end with #skip_tracks(playlist,3)' do | |
skip_tracks(@playlist,3) | |
@playlist.should == PLAYLIST3 | |
end | |
it 'should move the last three tracks to the start with #skip_tracks(playlist,-3)' do | |
skip_tracks(@playlist,-3) | |
@playlist.should == PLAYLIST4 | |
end | |
it 'should move the first four tracks to the end with #skip_tracks(playlist,3)' do | |
skip_tracks(@playlist,4) | |
@playlist.should == PLAYLIST4 | |
end | |
it 'should move the last four tracks to the start with #skip_tracks(playlist,-3)' do | |
skip_tracks(@playlist,-4) | |
@playlist.should == PLAYLIST3 | |
end | |
it 'should move the first track to the end with #skip_tracks(playlist,8)' do | |
skip_tracks(@playlist,8) | |
@playlist.should == PLAYLIST1 | |
end | |
it 'should move the last track to the start with #skip_tracks(playlist,-8)' do | |
skip_tracks(@playlist,-8) | |
@playlist.should == PLAYLIST6 | |
end | |
end |
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