Migrating from Skript

FastScript is not a drop-in replacement: the syntax is similar, but the language is its own. A table for rewriting typical pieces.

Equivalents

Skript	FastScript
on join:	on player join: (variants in the event reference)
command /heal <player>: + trigger:	command heal(target : text) permission ...: (the body is the handler)
permission: ... inside a command	permission <node> in the command header
send "hi" to player	message "hi" (to the event player)
broadcast "..."	broadcast "..."
give diamond sword to player	give "DIAMOND_SWORD" 1
heal player / damage player by 4	heal 4 / damage 4 (event player) or set-health(p, 20)
teleport player to ...	teleport(x, y, z) (event player)
kill player	kill
set {x} to 5	$x = 5 (global) / #x = 5 (player) / let x = 5 (local)
{x} / {x::%player%}	$x / #x
if ...: else:	the same
loop 10 times:	loop 10 times: (loop-index instead of loop-number - 1)
loop ...: over a list	for x in list:
while ...:	the same
stop / return	the same (stop takes no value)
cancel event	cancel-event
%player% in text	concatenation: "Hi " + sender-name()
player's health	victim.health / sender() + .health
function f(p) :: number:	function f(p) : number:
if player has permission "..."	if has-permission(me, "..."):

Migration traps

1. Stricter indentation: spaces only (tab = 4), mixed is an error.
2. No event text: chat contents, block coordinates are unavailable.
3. No delays: there is no replacement for wait 5 seconds (the scheduler isn't exposed).
4. Stricter types: null + 1 crashes instead of yielding 1 — initialize counters.
5. is = ==: is "admin" is equality, not a type/role check.
6. Pure functions: effects and $/# in them are compile errors.
7. Commands go in plugin.yml: Skript registers them itself; here, by hand.
8. The player variable: don't name locals that — you'll shadow the builtin.
9. join() is for lists: joining two strings uses +.
10. for over a non-list is silent: an empty loop instead of an error.