pop
UK[pɒp] US[pɑ:p]
vi. (unexpectedly, suddenly) appear; appear suddenly; make a popping sound; (suddenly) action
vt. (suddenly) reach out; (suddenly) ask a question; (suddenly take out something prepared); strike
n.pop music ; soda; (especially used as a title) dad; (quickly marked)
adj. pop music; popular style; popular; modern
adv. explosion; bang
abbr.post office protocol
Third person singular: pops Plural: pops Present participle: popping Past tense: popped Past participle: poppe
push
UK[pʊʃ] US[pʊʃ]
vt.& vi. Push, push
vt. Press; push, increase; exert pressure on... , force; persuade
n. push, determination; large-scale offensive; determined pursuit
vi. advance; increase; strive for
Third person singular: pushes present participle : pushing past tense: pushed past participle: pushed
redis RPOPLPUSH command syntax
Function:Command RPOPLPUSH performs the following two actions within an atomic time: pop the last element (tail element) in the list source and return it to the client. Insert the element popped up by source into the list destination as the head element of the destination list.
Syntax:RPOPLPUSH source destination
Available versions:>= 1.2.0
Time complexity :O(1)
Returns:The element being popped.
redis RPOPLPUSH command example
# source 和 destination 不同 redis> LRANGE alpha 0 -1 # 查看所有元素 1) "a" 2) "b" 3) "c" 4) "d" redis> RPOPLPUSH alpha reciver # 执行一次 RPOPLPUSH 看看 "d" redis> LRANGE alpha 0 -1 1) "a" 2) "b" 3) "c" redis> LRANGE reciver 0 -1 1) "d" redis> RPOPLPUSH alpha reciver # 再执行一次，证实 RPOP 和 LPUSH 的位置正确 "c" redis> LRANGE alpha 0 -1 1) "a" 2) "b" redis> LRANGE reciver 0 -1 1) "c" 2) "d" # source 和 destination 相同 redis> LRANGE number 0 -1 1) "1" 2) "2" 3) "3" 4) "4" redis> RPOPLPUSH number number "4" redis> LRANGE number 0 -1 # 4 被旋转到了表头 1) "4" 2) "1" 3) "2" 4) "3" redis> RPOPLPUSH number number "3" redis> LRANGE number 0 -1 # 这次是 3 被旋转到了表头 1) "3" 2) "4" 3) "1" 4) "2"