Functions in JSLogo can be repeated continuosly or a set number of times. This is done with the control structures of repeat and loop.

The repeat command takes a single argument, the number of times the repeat should run, and is followed by square brackets. In many cases it can be useful to use a counter variable while doing this.

make "counter 0
repeat 4 [
    make "counter :counter + 1
    print :counter

]

Result:

1
2
3
4

The loop command takes no arguments and is followed by square brackets. This will repeat a set of commands indefinitely.

loop [
    print 'running'
    wait 5
]

Result:

running
running
running
running
//this continues forever

It's possible to end a loop or repeat with the break command. This will stop the current loop.

loop [
    print 'running'
    if :condition = true [
        break
    ]
]

Result:

running
running

The wait command, used in above examples, waits the provided number of deciseconds (wait 10 = 1 second). Note that due to the way browsers handle throttling wait does not work reliably when the tab or window running LbyM is not in focus.