文档链接:ruby文档地址
delete()
- 简介:
从self中删除等于obj的所选项。返回最后删除的项,如果找不到匹配项,则返回nil。如果给定了可选代码块,则如果找不到该项,则返回该代码块的结果。(要删除nil元素并获得有信息量的返回值,请使用#compact!)
- String范例:
“(aa11234[s]d)d”.delete("()[]") => “aa11234sdd”
- Array范例:
pry(main)> a = [12,3,5]
=> [12, 3, 5]
pry(main)> a.delete(3)
=> 3
pry(main)> a
[12, 5]
group_by()
- 使用
pry(main)> [{a:23,n:3},{a:12,d:3},{a:11}].group_by{|item| item[:a]}
=> {23=>[{:a=>23, :n=>3}], 12=>[{:a=>12, :d=>3}], 11=>[{:a=>11}]}
sort()
- 简单范例:
pry(main)> [3,3,4,3,2,1,0,34,12,121].sort
=> [0, 1, 2, 3, 3, 3, 4, 12, 34, 121]
- 指定列排序:
pry(main)> [{a:23,n:3},{a:12,d:3},{a:11}].sort{|item| item[:a]}
=> [{:a=>11}, {:a=>12, :d=>3}, {:a=>23, :n=>3}]
revserse
- sort的扩展
pry(main)> [{a:23,n:3},{a:12,d:3},{a:11}].sort{|item| item[:a]}.reverse
=> [{:a=>23, :n=>3}, {:a=>12, :d=>3}, {:a=>11}]