Statements

Local declaration and assignment

let total = 0
total = total + loop-index
total += 5
list[0] = "first"

• let name = <expression> — explicit local declaration (= required).
• Plain and compound assignment: = += -= *= /= %=.
• Targets: local, $global, #player variable, list[i] / map[key], and player properties (victim.health = 20 writes through PlayerAccess.set).
• Postfix increment: i++, i-- (plus prefix ++x, --x).

Branching

if victim is null:
    message "Nobody here."
    stop

else / else if are supported, a blank line between branches is allowed:

if n < 2:
    return n
else if n < 10:
    return n * 2
else:
    return -1

Loops

while i > 0:
    result = result + i + ","
    i = i - 1

loop n times:
    total = total + loop-index

for friend in online-players():
    message "Online: " + friend

• while <condition>: — classic loop.
• loop <N> times: — exactly N iterations (times may be omitted); loop-index is the zero-based iteration number. The limit and the index live in different JVM slots (an old "loop runs once" bug lived right here).
• for <var> in <list>: — the source must be a list (Values.toList). Anything else iterates zero times, silently.
• break / continue — inside loops only, otherwise a compile error.

Flow control

Statement	Action
stop	Stop the handler (also exits a function)
return [expr]	Return a value from a function
cancel-event	Effect: cancel the Bukkit event (if cancellable)

Effects: calls without parentheses

Effects accept a "bare" form — name plus space/comma-separated arguments:

message "Healing " + target
give "DIAMOND" 3
log "FastScript routines are ready."

The parenthesized equivalent (message("hi")) works too, as does a lone zero-argument name (kill). Parsing rule: a name followed by the start of another expression on the same line (text, number, variable, true/false/null/not) is an effect; name + ... with an operator is an expression. Write negative bare arguments in parentheses: damage(-5).

Ternary

message "You are " + (victim is null ? "nobody" : victim)

Precedence: ?: is the lowest, branches are full expressions.