JavaScript (strict) equality of new String("a") objects

Question

There is in the ECMAScript Language Specification 11.9.1 The Equals Operator (==):

NOTE 3 The equality operator is not always transitive. For example, there might be two distinct String objects, each representing the same String value; each String object would be considered equal to the String value by the == operator, but the two String objects would not be equal to each other. For Example:

• new String("a") == "a" and "a" == new String("a") are both true.
• new String("a") == new String("a") is false.

but in 11.9.6 The Strict Equality Comparison Algorithm:

7. Return true if x and y refer to the same object. Otherwise, return false.

But no, with jsc

new String("a")===new String("a")

is true.

Is that a jsc.exe error? Or are they the same object? Than why?

Answer 1

The operator === in js return true if is equal type and equal value. So is correct that it return true because they are both String object and their value is "a".

Have a look at the documentation http://www.w3schools.com/js/js_comparisons.asp