Examples

• 1.hello-world
• 2.variables
• 3.types
• 4.conditions
• 5.looping
• 6.subroutines
• 7.arrays
• 8.hashes
• 9.operators
• 10.classes
• 11.list-comprehension
• 12.junctions
• 13.pattern-match
• 14.whatever
• 15.twigil
• 16.set
• 17.feed
• 18.flip
• 19.signatures
• 20.io
• 21.enum
• 22.traits
• 23.gather-take
• 24.subset
• 25.sort
• 26.smartmatch
• 27.roles
• 28.multi-dispatch
• 29.meta-operators
• 30.aomtic
• 31.binding
• 32.classify
• 33.destructure
• 34.dbi
• 35.dynamic-variables
• 36.labels
• 37.main
• 38.operators
• 39.pod
• 40.regex
• 41.q
• 42.topic_variable
• 43.hyper_operator
• 44.colonpairs
• 45.grammar
• 46.datetime
• 47.comb
• 48.chained_comparison
• 49.unicode
• 50.when
• 51.with
• 52.rotor
• 53.series_operator
• 54.range
• 55.slip
• 56.react_whenever
• 57.introspection
• 58.promise
• 59.threads

# 取出上一个月的所有周的周一和周日对应的日期， 即上个月的自然周
enum DoW < Sunday Monday Tuesday Wednesday Thursday Friday Saturday >;

# 所有周六
# say (Date.new("2018-01-01")..Date.new("2018-12-31")).grep( *.day-of-week == Saturday );

# 所有周日
say (Date.new("2018-01-01")..Date.new("2018-12-31")).grep( *.day-of-week == (Sunday + 7) );