RosettaCodeData/Task/Fibonacci-sequence/Lang/fibonacci-sequence-1.lang

fp.fib = ($n) -> {
	if($n < 2) {
		return $n
	}
	
	$prev = 1
	$cur = 1
	$i = 2
	while($i < $n) {
		$tmp = $cur
		$cur += $prev
		$prev = $tmp
		
		$i += 1
	}
	
	return $cur
}