Sparkline in unicode

var bar = @('▁'..'█')
loop {
    print 'Numbers, please, separated by space/commas: '
    var numbers = read(String).trim.split(/[\s,]+/).map{.to_n}
    var (min, max) = numbers.minmax
    say "min: %5f; max: %5f"%(min, max)
    var div = ((max - min) / bar.end)
    say (min == max ? bar.last*numbers.len : numbers.map{|num| bar[(num - min) / div]}.join)
}

Output:

Numbers, please, separated by space/commas: 1 2 3 4 5 6 7 8 7 6 5 4 3 2 1
min: 1.000000; max: 8.000000
▁▂▃▄▅▆▇█▇▆▅▄▃▂▁
Numbers, please, separated by space/commas: 1.5, 0.5 3.5, 2.5 5.5, 4.5 7.5, 6.5
min: 0.500000; max: 7.500000
▂▁▄▃▆▅█▇