In Redis, the LTRIM command allows us to trim a list to a specified number of elements. We specify the starting and ending index, which is used to trim the list to just that range.
Category: NoSQL
Redis LSET Command Explained
In Redis, the LSET command allows us to set a list element to a different value, based on its index.
Redis LREM Command Explained
In Redis, we can use the LREM command to remove one or more elements from a list. The number of elements removed depends on the arguments we pass.
Redis LINSERT Command Explained
In Redis, the LINSERT command allows us to insert an element into a list.
We have the choice of inserting it either before or after a specified element.
Continue readingSet an Expiry on an Existing Redis Key Only When the Key Doesn’t Already Have an Expiry
When setting an expiry for an existing key in Redis, we now have the option to set the expiry only if the key doesn’t already have an expiry. That’s because Redis 7.0.0 introduced some new options that allows us to do this and other things.
In this case, we can use the NX option when setting the expiry to specify that the expiry should only be set if the key doesn’t already have an expiry. We can use this option on commands such as EXPIRE, EXPIREAT, PEXPIRE, and PEXPIREAT.
Redis LPOS Command Explained
In Redis, the LPOS command returns the index of matching elements inside a list.
Redis BLMOVE Command Explained
In Redis, the BLMOVE command is the blocking variant of LMOVE.
When the specified list contains elements, it atomically returns and removes either the first or last element of the given source list, and pushes the element at either the first or last element of the specified destination list. Whether it’s the first or last element depends on the arguments passed to the command.
Continue readingRedis LMOVE Command Explained
In Redis, the LMOVE command atomically returns and removes either the first or last element of the given source list, and pushes the element at either the first or last element of the specified destination list.
Whether it’s the first or last element depends on the arguments passed to the command.
The LMOVE command can be used in place of the RPOPLPUSH command, which has been deprecated since Redis 6.2.0.
Redis LINDEX Command Explained
In Redis, the LINDEX command returns the element at the specified index at the specified key.
Redis LLEN Command Explained
In Redis, the LLEN command returns the length of the list stored at the specified key.