摘要：
创建(特殊的)Hash[]Hash[‘a’,1,’b’,2]->yesHash[‘a’,1,’b’,’b’]->noHash[[[‘a’,1],[‘b’,2]]]->yes删除delete (有个带if的条件删除)清除用clear遍历each开头的each {| key, value| block ... 阅读全文
摘要：
[]中的索引 a = "hello there" a[1] #=> "e" a[2, 3] #=> "llo" a[2..3] #=> "ll" a[-3, 2] #=> "er" a[7..-2] #=> "her" a[-4..-2] #=> "her" a[-2..-4] #=... 阅读全文