array = [1, 3, 5, 7, 9]

p array.bsearch {|n| n > 6 }
p array.bsearch {|n| n > 10}

p array.bsearch {|n| n < 4 }

array = [24, 1, 365]
p array.join
array.join('-')

# Python
#'-'.join(list)

array*'-'

array * 3

array = [1, 2]

p array.hash
array.reverse!
array.hash

:foo.hash

:foo.hash

p 'foo'.hash
'foo'.hash

hash = {one: 1, two: 2}

hash.each do |k, v|
  puts "#{k}: #{v}"
end

hash.each_key do |k|
  puts k
end

hash.each_value do |v|
  puts v
end

hash = {}
hash[:foo] = 'bar'

hash

hash = {foo: 'bar'}

hash.delete(:foo)
hash

hash = {foo: 1, bar: 2, buzz: 3}

hash.select! {|k,v| v.odd?}
p hash

hash = {foo: 1, bar: 2, buzz: 3}

hash.reject!{|k, v| v.odd?}
hash

hash = {foo: 1, bar: 2, buzz: 3}

p hash.keep_if {|k, v| true}
hash.delete_if {|k, v| false}

hash = {foo: 1, bar: 2, buzz: 3}
p hash.select! {|k, v| true}

hash = {foo: 1, bar: 2, buzz: 3}
p hash.reject! {|k, v| false}

hash = {foo: 1, bar: 2, buzz: 3}

p hash.select {|k,v| v.odd?}
p hash.reject {|k,v| v.odd?}
hash

names = {a: 'alice', b: 'bob', c: 'chalie'}

names.transform_values {|name| name.capitalize}

names = {a: 'alice', b: 'bob', c: nil}
names.compact