Page 190 - JavaScript

0 == ""; // true

Relational operators (<, <=, >, >=)

When both operands are numeric, they are compared normally:

1 < 2 // true
2 <= 2 // true
3 >= 5 // false
true < false // false (implicitly converted to numbers, 1 > 0)

When both operands are strings, they are compared lexicographically (according to alphabetical
order):

'a' < 'b' // true
'1' < '2' // true
'100' > '12' // false ('100' is less than '12' lexicographically!)

When one operand is a string and the other is a number, the string is converted to a number
before comparison:

'1' < 2 // true
'3' > 2 // true
true > '2' // false (true implicitly converted to number, 1 < 2)

When the string is non-numeric, numeric conversion returns NaN (not-a-number). Comparing with
NaN always returns false:

1 < 'abc' // false
1 > 'abc' // false

But be careful when comparing a numeric value with null, undefined or empty strings:

1 > '' // true
1 < '' // false
1 > null // true
1 < null // false
1 > undefined // false
1 < undefined // false

When one operand is a object and the other is a number, the object is converted to a number
before comparison.So null is particular case because Number(null);//0

new Date(2015)< 1479480185280 // true
null > -1 //true
({toString:function(){return 123}}) > 122 //true

Inequality

Operator != is the inverse of the == operator.

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