How to run

npm install
npm run start

redis commands

• String
  • set firstName "Manny MM"
  • get firstName
  • decr num1
  • incr num1
  • incrby num1 3
  • getset firstName Stephanie 会得到Many MM，因为是先读后写
  • mget
• Hash
  • hget,hset,hgetall
  • hmset user:345 firstName Tracey lastName Larventz street awesome city awesome age 33
  • hgetall user:345 -> will get 8 strings
  • hget user:345 city -> will get "awesome"
  • hmget user:345 firstName lastName -> will get "Tracey" "Larventz"
  • hexists user:345 zip -> will get 0 meaning not exist, 1 for exist
  • hincrby user:345 age 3-> will get 36
  • 这个Hash的成员比较少时Redis为了节省内存会采用类似一维数组的方式来紧凑存储，而不会采用真正的HashMap结构，对应的value redisObject的encoding为zipmap,当成员数量增大时会自动转成真正的HashMap,此时encoding为ht。
• List 左右都开口
  • lpush,rpush,lpop,rpop,lrange
  • rpush groceries apples cherries pears "red meat" ->get 4
  • lrange groceries 0 -1 -> will get 4 strings
  • lpush groceries grapes -> will get 5, and grapes will be on the first position before apples
  • lpop groceries -> will get "grapes" and remove grapes
  • same rpop
  • ltrim groceries 0 4 will remove other strings than [0-4]
  • Redis list的实现为一个双向链表，即可以支持反向查找和遍历，更方便操作，不过带来了部分额外的内存开销，Redis内部的很多实现，包括发送缓冲队列等也都是用的这个数据结构。
• Set
  • sadd,spop,smembers,sunion
  • sadd tags "react native" graphal javascript
  • smembers tags
  • sadd tags framer sketch -> will get 2
  • sismember tags typescript -> will get 0 meaning is not member, 1 for is member
  • sadd tags: react "react router" redux "react transition group"
  • smembers tags:react
  • sunionstore tags:"react native" tags:react
  • smembers tags:"react native"
  • spop tags:"react native"
  • scard tags -> will get 6
• Sorted Set
  • zadd,zrange,zrem,zcard
  • zadd rocket 1969 "apollo 11" 1998 "Deep space 1" 2008 "Falcon 1" -> will get 3
  • zrange rocket 0 -1
  • zrange rocket 0 -1 withscores
  • zrevrange rocket 0 -1 withscores
  • zrank rocket "Deep space 1"