Bug 94681 – Layout test fast/js/array-functions-non-arrays.html should not expect Array.prototype.toLocaleString.call({}) to throw

• Status: NEW
• Component: Tools / Tests

[Ulan Degenbaev]

Layout test "fast/js/array-functions-non-arrays.html" has a test case that seems to be incorrect:

> shouldThrow("Array.prototype.toLocaleString.call({})");

The correct case would be 

> shouldBe("Array.prototype.toLocaleString.call({})", "");

ECMA 262/15.4.4.3 states that "The toLocaleString function is intentionally generic; it does not require that its this value be an Array object." 

Following the algorithm in the spec for {}, we get:

1. O = {}
2. arrayLen = O.length = undefined
3. len = ToUint32(arrayLen) = 0
4. set separator from locale
5. If len is zero, return the empty String.

At the moment JSC throws 'TypeError' when evaluating 'Array.prototype.toLocaleString.call({})'. Chrome and Firefox return empty string.