@Alphabot6 - Detecting Worldborder Size

Refer to: https://www.youtube.com/watch?v=sm0R4rUs5IY


PREREQUISITES:

/scoreboard objectives add BORDER dummy
/scoreboard players set #SIZE BORDER 0


CLOCK COMMAND:

/worldborder get


STAT SET:

/stats block ~ ~-1 ~ set QueryResult #SIZE BORDER

or

/setblock ~ ~ ~ minecraft:command_block 0 replace {Command:"worldborder get",CommandStats:{QueryResultName:"#SIZE",QueryResultObjective:"BORDER"}}

TESTING:

/scoreboard players test #SIZE BORDER 20 *

/tellraw @a "There border is at least 20 blocks in size."
/tellraw @a ["(The actual border size is ",{score:{name:"#SIZE",objective:"BORDER"}},")"]

EXPLANATION:

The "/worldborder get" command will return the width of the border in blocks to the initiator. This doesn't do anything further without the aid of CommandStats. Setting the "QueryResult" stat will take that output and set a players' score. Using that, we can set the score of a fake player to the size of the worldborder, and then test for that size.