Javascript Variables

[shane18]

When you do...

 

if(X == 0){

}

 

if I didn't use X in anything before... does X automatically = 0/false like it does in php or does it == NULL?

[shane18]

also, when using arrays must you declare it?

 

Example:

var my_new_array = new Array();

 

is the code above required or can u just go

 

Example:

my_new_array[2] = "test";
//OR
my_new_array = phone_number.split("-");