An issue about Object.prototype.isPrototypeOf

[YiWen-y]

Revision

rhino-1.7.11

Test case

var f = function (){
    print(typeof Object.prototype.isPrototypeOf);
    var a = Object.prototype.isPrototypeOf.call(undefined, []);
    print("a:", a);
};
f();

Execution steps

java -jar rhino-1.7.11.jar -debug -version 200 testcase.js

Output

function
a: false

Expected behavior

Throw a Type Error in line 3.

Description

According to ES standard, the this value should be converted via ToObject in case of the isPrototypeOf call . The ToObject should throw and error for undefined values.

[rbri]

Have added a pull request but i can't reproduce your finding. What is wrong with the test?

[rbri]

This is fixed now. Please close.