HINCRBY for numeric fields in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to increment the field 'score' by 1 in the hash 'player1'.

Redis

HINCRBY player1 score [1]

Drag options to blanks, or click blank then click option'

A-1

B1

CINCR

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string like 'INCR' instead of a number.

Using 0 which does not change the value.

Using a negative number when you want to increase.

The HINCRBY command increments the numeric value of a field in a hash by the given integer. Here, we want to increase 'score' by 1.

2fill in blank

medium

Complete the code to decrease the field 'lives' by 2 in the hash 'game_stats'.

Redis

HINCRBY game_stats lives [1]

Drag options to blanks, or click blank then click option'

A-2

B2

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using positive 2 which increases the value.

Using 0 which does not change the value.

To decrease a numeric field, use a negative number with HINCRBY. Here, we subtract 2 from 'lives'.

3fill in blank

hard

Fix the error in the command to increment 'points' by 5 in the hash 'user1'.

Redis

HINCRBY user1 points [1]

Drag options to blanks, or click blank then click option'

A'5'

Bfive

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around the number.

Using words instead of numbers.

The increment value must be an integer without quotes. Using '5' or 'five' causes errors. Use 5 as a number.

4fill in blank

hard

Fill both blanks to increment 'score' by 10 and decrement 'lives' by 1 in the hash 'player2'.

Redis

HINCRBY player2 score [1]
HINCRBY player2 lives [2]

Drag options to blanks, or click blank then click option'

A10

B-1

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using positive 1 instead of -1 for decrement.

Using 0 which does not change values.

Use 10 to increase 'score' and -1 to decrease 'lives'. Both are valid increments for HINCRBY.

5fill in blank

hard

Fill all three blanks to increment 'coins' by 15, decrement 'health' by 5, and increment 'level' by 2 in the hash 'game_data'.

Redis

HINCRBY game_data coins [1]
HINCRBY game_data health [2]
HINCRBY game_data level [3]

Drag options to blanks, or click blank then click option'

A5

B-5

C2

D15

Attempts:

3 left

💡 Hint

Common Mistakes

Using positive 5 instead of -5 for health decrement.

Mixing up the numbers for each field.

Increment 'coins' by 15, decrement 'health' by 5 (negative number), and increment 'level' by 2 using HINCRBY.