Help whats wrong with this script

Unity Engine
1

it reads this error message: Assets/enemy.js(1,13): BCE0043: Unexpected token: -,

var health: -10 ;
var TakeDamage : boolean;

function OnTriggerEnter(other : Collider){
	if(other.tag == "Player"){
		TakeDamage - true;
	}
}

function OntriggerExit(other: Collider){
	if(other.tag == "Player"){
		TakeDamage - false;
	}
}

function Update(){
	if(TakeDamage){
		if(Input.GetButtonDown("Fire1")){
			health --;
		}
	}
	if(health <- 1){
	print("Enemy Down!");
	health - 0;
	Destroy (gameObject);
	}
}
2

line 6: TakeDamage = true; // TakeDamage - true;
line 12: TakeDamage = false; //TakeDamage - false;
line 24: health = 0; //health - 0;

Line 1 is probably also wrong, since your enemy is starting out dead (-10). But I don’t know what your intent is there.