Using Obj-C Blocks from MacRuby with Ruby 1.9.2 Syntax

gistfile1.rb

# 1 # Processing enumerated arrays using two blocks
area = "Europe"
timeZoneNames = NSTimeZone.knownTimeZoneNames
areaArray = NSMutableArray.arrayWithCapacity 1
areaIndexes = timeZoneNames.indexesOfObjectsWithOptions NSEnumerationConcurrent, 
                passingTest: -> (obj, idx, stop) {
                                tmpStr = obj
                                tmpStr.hasPrefix area
                }
tmpArray = timeZoneNames.objectsAtIndexes areaIndexes
tmpArray.enumerateObjectsWithOptions NSEnumerationConcurrent|NSEnumerationReverse,
  usingBlock: -> (obj, idx, stop) {
    areaArray << obj.substringFromIndex(area.length+1)
    # areaArray << obj[area.size+1..obj.size] #ruby

}
puts "Cities in #{area} time zone: #{areaArray}"


# 2 # Using a block to find matching substrings in a string
musician = "Beatle"
musicDates = NSString.stringWithContentsOfFile "/usr/share/calendar/calendar.music",
                                      encoding:NSASCIIStringEncoding, 
                                         error:nil
                                         
musicDates.enumerateSubstringsInRange NSMakeRange(0, musicDates.length-1),
                              options:NSStringEnumerationByLines,
                           usingBlock:->(substring, substringRange, enclosingRange, stop) {
                              found = substring.rangeOfString musician
                              puts "#{substring}" if (found.location != NSNotFound) 
                           }
                          


# 3 # Sorting an array using an NSComparator block 
              
stringsArray = ["string 1","String 21","string 12","String 11","String 02","aTRing 1","aTring 1"]
comparisonOptions = NSCaseInsensitiveSearch | NSNumericSearch | NSWidthInsensitiveSearch | NSForcedOrderingSearch

finderSort = -> (string1, string2) {
  currentLocale = NSLocale.currentLocale
  string1Range = NSMakeRange(0, string1.length)
  string1.compare(string2, options:comparisonOptions, range:string1Range, locale:currentLocale) 
}
puts "finderSort: #{stringsArray.sortedArrayUsingComparator(finderSort)}"