lrem

1. 基本語法

lrem(key, count , value)

刪除串列中全部或部分的value，刪除的次數及方法取決於count參數。

count取值	刪除規則
count等於0	刪除串列中所有位置的value
count大於0	則從串列最前端開始往後依序刪除count個value
count小於0	則從串列最末端開始往前依序刪除|count|個value

2. 範例

(1) 刪除串列中前2個A，count = 2

TypeScript

client.del('foo');

const foo_list = ['-','A', '-', 'A', '-', 'A', '-', 'A', '-'];
client.rpush('foo', foo_list);
client.lrange('foo', 0, -1, redis.print);

client.lrem('foo', 2, 'A');
client.lrange('foo', 0, -1, redis.print);

Output-TS

Reply: 1,A,2,A,3,A,4,A,5
Reply: 1,2,3,A,4,A,5

(2) 刪除串列中倒數2個A，count = -2

TypeScript

client.del('foo');

const foo_list = ['-','A', '-', 'A', '-', 'A', '-', 'A', '-'];
client.rpush('foo', foo_list);
client.lrange('foo', 0, -1, redis.print);

client.lrem('foo', -2, 'A');
client.lrange('foo', 0, -1, redis.print);

Output-TS

Reply: -,A,-,A,-,A,-,A,-
Reply: -,A,-,A,-,-,-

(3) 刪除串列中所有A，count = 0

TypeScript

client.del('foo');

const foo_list = ['-','A', '-', 'A', '-', 'A', '-', 'A', '-'];
client.rpush('foo', foo_list);
client.lrange('foo', 0, -1, redis.print);

client.lrem('foo', 0, 'A');
client.lrange('foo', 0, -1, redis.print);

Output-TS

Reply: -,A,-,A,-,A,-,A,-
Reply: -,-,-,-,-