repeat (foo)
if <something> then
Break out of loop // exit the loop and continue with the script
end
end

set [foo v] to (0) //I use foo as index
set [stop v] to (0)
repeat until <<(foo) > (19)> or <(stop) = (1)>>
...::#999999
change [foo v] by (1)
end
set [stop v] to (0)

forever
if <key [space v] pressed?> then
set [stop v] to (1)
end
end

repeat (20)
if <something::grey> then
... // the scripts you wanted to put after the loop go here instead
stop [this script v] // prevents the loop from running again
end
end

forever
if <... ::sensing> then
broadcast [... v]
stop [this script v]
end
end
when I receive [... v]
Your code... ::grey

... //Your code before the loop
Breakable loop
... //Your code after the loop

define Breakable loop
repeat (foo)
if <something> then
stop [this script v]// exit the loop and continue with the script
end
end