if(rsg_id != '') in javascript code example

Example 1: or operator in javascript

//The OR operator in Javascript is 2 verticals lines: ||

var a = true;
var b = false;

if(a || b) {
	//one of them is true, code inside this block will be executed
}

Example 2: === javascript

// ===	means equal value and equal type
var x = 5

// true
x === 5

// false
x === "5"