// Demo the difference between == and ===
alert(5 == "5");
alert(5 === "5");

// Check out what happens with >
alert(5 > "4");
alert(5 > 4);

true
false

true
true

typeof a === typeof b && a > b

var num_as_string = '4';
var num = +num_as_string;
if (5 > num) { ... }

12 > '100' // false
'12' > 100 // false
'12' > '100' // true

null > 0 // false
null < 0 // false
null >= 0 // true