Loop – What is it ?

17/08/2021 | 2min

A loop is a structure that allows you to easily repeat commands lot, there are different types of loops in programing.

• infinite loop
  An infinite loop is a loop as no condition , The result is that the loop repeats continually.
• while
  A while loop checks a given condition before it executes the loop
• do while
  A do while loop checks a given condition after it executes the loop
• ...

How to create infinite loop with command block

For an infinite loop, place a simple repeating command block and set it to automatic. (1)
Connect the other chain command blocks to execute the commands in the loop. (2)

Get repeating command block:

give @p repeating_command_block

Get chain command blocks:

give @p chain_command_block

For stop the infinite loop, set to Always Active to Needs Redstone (in the repeating command block GUI editor)

How to create while with command block

To create a while loop, create a condition after the repeating command block (1).
To create a condition we can use the /execute command (3).

pattern: /execute <condition> run <command>

In this example, the condition checks if the block at ~ ~1 ~ position is a dirt block and if the condition is true then stop the loop with /setblock command (or /data modify block).

Chain command block (3.1)

execute if block ~ ~1 ~ dirt data modify block ~-1 ~ ~ auto set value 0

Chain command block (3.2)

execute if block ~-1 ~1 ~ dirt run setblock ~2 ~ ~ minecraft:gold_block

Chain command block (3.3)

execute unless block ~-2 ~1 ~ dirt run setblock ~1 ~ ~ minecraft:chain_command_block[facing=south] replace

And connect the other chain command blocks to execute the commands in the loop. (2)

How to create do-while with command block

To create a do-while loop, create a condition before the repeating command block (1).

In this example, the condition checks if the block at ~ ~1 ~ position is a dirt block and if the condition is true then stop the loop with /setblock command. (or /data modify block)

execute if block ~ ~1 ~ dirt run setblock ~ ~ ~-2 minecraft:repeating_command_block[facing=east]{auto:0} destroy

with command /data modify block

execute if block ~ ~1 ~ dirt data modify block ~ ~ ~-2 auto set value 0