ruby on rails內建方法之物件是否為空blank?
puts [ ].blank? #=> true
puts .blank? #=> false
puts " cat ".blank? #=> false
puts "".blank? #=> true
puts " ".blank? #自動去除前後空格=> true
puts nil.blank? #=> true
ruby on rails內建方法之排序：group_by()
groups = posts.group_by
ruby on rails內建方法之組句：to_sentence()
puts [ "ant", "bat", "cat"].
to_sentence #=> "ant, bat, and cat"
puts [ "ant", "bat", "cat"].
to_sentence(:connector =>
"and not forgetting")
#=> "ant, bat, and not forgetting cat"
puts [ "ant", "bat", "cat"].
to_sentence(:skip_last_comma => true)
#=> "ant, bat and cat"
ruby on rails內建方法之分組：in_groups_of()
[1,2,3,4,5,6,7].in_groups_of(3)
#=> [1, 2, 3]
[4, 5, 6]
[7,nil, nil]
[1,2,3,4,5,6,7].in_groups
_of(3,"x")
#=> [1, 2, 3]
[4, 5, 6]
[7,"x", "x"]
ruby on rails內建方法之字串方法：
string = "now is the time"
puts string.at(2) #=> "w"
puts string.from(8) #=> "he time"
puts string.to(8) #=> "now is th"
puts string.first #=> "n"
puts string.first(3) #=> "now"
puts string.last #=> "e"
puts string.last(4) #=> "time"
puts string.starts_with?("no") #=> true
puts string.ends_with?("me") #=> false
count = hash.new(0)
string.each_char
p count #=>
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