On Wed, Feb 14, 2018 at 5:15 AM, Maxim Vaarwel <palosh...@gmail.com> wrote: >> >> "Whether the toString function can be applied successfully to a host object is implementation-dependent". What "implementation-dependent" > > What does this sentence say? What kind of implementation are we talking about (The algorithm toString is concrete described)?
The most recent spec I can find with that sentence is the 5th edition, which is 3-4 editions out of date. I suggest using the [latest draft standard][2] as your primary reference. To answer your question: The implementation in question is the implementation of the host object, not `toString`. In the 5th edition, ["host object"][1] is defined as: > object supplied by the host environment to complete the execution environment of ECMAScript For instance, a DOM object in a browser. ECMAScript cannot say that applying `Array.prototype.toString` or `Object.prototype.toString` to a host object will necessarily work as described (for instance, `Object.prototype.toString.call(domElement)`); it depends on the implementation of the host object. -- T.J. Crowder [1]: http://ecma-international.org/ecma-262/5.1/#sec-4.3.8 [2]: https://tc39.github.io/ecma262/
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