Challenge: INCR and DECR
You are working with a platform where users can like or dislike various posts. Each post has a unique identifier, such as post:1
, post:2
, post:3
.
The task is to build a system to track reactions on multiple posts by randomly adding likes and dislikes, and then displaying the total count of reactions for each post.
-
Create 3 posts, each with two counters: one for likes and one for dislikes. For example:
post:1:likes
,post:1:dislikes
, and so on; -
Use the
INCR
orINCRBY
command to add likes and dislikes to each post. Add 3 likes and 2 dislikes topost:1
, and 5 likes and 1 dislike topost:2
; -
Use the
DECR
orDECRBY
command to decrease reactions for some posts. Remove 1 like frompost:1
and 2 dislikes frompost:2
; -
Use the
GET
command to retrieve the current number of likes and dislikes for each post.
The expected result should look like this:
Post 1: 2 likes, 2 dislikes
Post 2: 5 likes, 0 dislikes
Post 3: 0 likes, 0 dislikes
Create counters for likes and dislikes for each post:
SET post:1:likes 0
SET post:1:dislikes 0
SET post:2:likes 0
SET post:2:dislikes 0
SET post:3:likes 0
SET post:3:dislikes 0
Add 3 likes and 2 dislikes to post:1
:
INCRBY post:1:likes 3
INCRBY post:1:dislikes 2
Add 5 likes and 1 dislike to post:2
:
INCRBY post:2:likes 5
INCRBY post:2:dislikes 1
Remove 1 like from post:1
and 2 dislikes from post:2
:
DECRBY post:1:likes 1
DECRBY post:2:dislikes 2
Retrieve the current number of likes and dislikes for each post:
GET post:1:likes
GET post:1:dislikes
GET post:2:likes
GET post:2:dislikes
GET post:3:likes
GET post:3:dislikes
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Can you explain how the INCRBY and DECRBY commands work in Redis?
What happens if I try to decrease a counter below zero?
How can I display the results in a more user-friendly format?
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Challenge: INCR and DECR
Свайпніть щоб показати меню
You are working with a platform where users can like or dislike various posts. Each post has a unique identifier, such as post:1
, post:2
, post:3
.
The task is to build a system to track reactions on multiple posts by randomly adding likes and dislikes, and then displaying the total count of reactions for each post.
-
Create 3 posts, each with two counters: one for likes and one for dislikes. For example:
post:1:likes
,post:1:dislikes
, and so on; -
Use the
INCR
orINCRBY
command to add likes and dislikes to each post. Add 3 likes and 2 dislikes topost:1
, and 5 likes and 1 dislike topost:2
; -
Use the
DECR
orDECRBY
command to decrease reactions for some posts. Remove 1 like frompost:1
and 2 dislikes frompost:2
; -
Use the
GET
command to retrieve the current number of likes and dislikes for each post.
The expected result should look like this:
Post 1: 2 likes, 2 dislikes
Post 2: 5 likes, 0 dislikes
Post 3: 0 likes, 0 dislikes
Create counters for likes and dislikes for each post:
SET post:1:likes 0
SET post:1:dislikes 0
SET post:2:likes 0
SET post:2:dislikes 0
SET post:3:likes 0
SET post:3:dislikes 0
Add 3 likes and 2 dislikes to post:1
:
INCRBY post:1:likes 3
INCRBY post:1:dislikes 2
Add 5 likes and 1 dislike to post:2
:
INCRBY post:2:likes 5
INCRBY post:2:dislikes 1
Remove 1 like from post:1
and 2 dislikes from post:2
:
DECRBY post:1:likes 1
DECRBY post:2:dislikes 2
Retrieve the current number of likes and dislikes for each post:
GET post:1:likes
GET post:1:dislikes
GET post:2:likes
GET post:2:dislikes
GET post:3:likes
GET post:3:dislikes
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