What's wrong with this script?

Unity Engine
1

Hi, I’m very new to Javascript, so I tried starting off making an easy script. Sadly, it did not work. I’m trying to make a triggerable trail, by using a box prefab (leech_trail_cube) and cloning it whereever my object goes. Although, since this may cause a bit of lag, I added a timer (wait). When I put this into unity, I get alot of errors, like (6,11) expecting (, found ‘Start’. I don’t understand where I went wrong. Could someone please correct this? Thank you!

var leech_trail_cube : Transform;
var wait = 0;
function Update() {wait=wait+1;}
if (wait == 30 )
(function Start(){;ar leech_trail_cube = Instantiate(leech_trail_cube, Vector3 (transform.position.x, transform.position.y, transform.position.z), Quaternion.identity)})

2

You probably want this:

var leech_trail_cube : Transform;
var wait = 0;

function Update() {
    wait=wait+1;
    if (wait == 30 )
    {
        leech_trail_cube = Instantiate(leech_trail_cube, Vector3 (transform.position.x, transform.position.y, transform.position.z),    
             Quaternion.identity)
    }
}
3

Oh, the errors… let me count the ways…
Start is a function and cannot be used within a function like that.

var leech_trail_cube : Transform;
var wait = 0;
function Update() {wait=wait+1;}
if (wait == 30 )
[COLOR="cyan"]([/COLOR][COLOR="red"]function Start(){;[/COLOR][COLOR="lime"]ar[/COLOR] leech_trail_cube = Instantiate(leech_trail_cube, Vector3 (transform.position.x, transform.position.y, transform.position.z), Quaternion.identity)[COLOR="red"]}[/COLOR][COLOR="cyan"]) [/COLOR]

OK… Cyan is a parenthesis block that should not be there… it should be … { }
red is a function… bad place to put it
green is the word “ar”… which should be “var”

Concept is that every 30 frames it should drop a cube so that you can see where you were.

Solution… Use a Coroutine to measure time, then create a cube where you were.

var leech_trail_cube : Transform;
var dropEvery = 1.0; // drop every one second

function Start(){ // Start IS a coroutine and can persist past one frame
	while(true){
		// drop a cube
		Instantiate(leech_trail_cube, transform.position, transform.rotation);
		// wait for seconds
		yield WaitForSeconds(dropEvery);
	} // go back to the while... and continue
}
4

Thank you so much, the code now works! Sorry about the “{;ar”, it’s not my lack of knowledge, just my typing. (The effect of this code is to make an triggerable trail (which can be added to a trail renderer) without causing too much lag.)