创建(特殊的)

Hash[]

Hash[‘a’,1,’b’,2]->yes

Hash[‘a’,1,’b’,’b’]->no

Hash[[[‘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 } → hshclick to toggle
source

each_pair {| key,
value | block } → hsh

each_key {| key | block } →
hsh