How to check if variable = to 1[SOLVED]

[filipe]

i have a variable called havekey if this var is set to 1 then i want it to destroy an instance
here is the code

//open
if havekey = 1;

with (obj_door)
{
instance_destroy();
}

 

[Tsa05]

if ( havekey == 1 )
{
    with (obj_door)
    {
        instance_destroy();
    }
}

 

[filipe]

Thank you i ended up having to change my variable to a global variable