String(symbol)

Nathan Wall wwall at google.com
Wed Aug 13 08:45:12 PDT 2014


Out of mere curiosity, why is it desired that `symbol + ''` throw?

Nathan



On Tue, Aug 12, 2014 at 10:39 PM, Erik Arvidsson <erik.arvidsson at gmail.com>
wrote:

> symbol + '' must continue to throw.
>
> I was suggesting that String(symbol) should not throw.
>
> This can be spec'ed as String( value ) checking the Type of the value and
> special case it in case of the value being a symbol.
>
>
> On Tue, Aug 12, 2014 at 5:17 PM, Claude Pache <claude.pache at gmail.com>
> wrote:
>
>>
>> Le 12 août 2014 à 22:35, Erik Arvidsson <erik.arvidsson at gmail.com> a
>> écrit :
>>
>> Right now String(symbol) throws because it uses ToString which is spec'ed
>> to throw.
>>
>> I'm suggesting that we special case String(value) to do a type check for
>> Symbol and return the same string as Symbol.prototype.toString.call(value)
>> does.
>>
>>
>> https://people.mozilla.org/~jorendorff/es6-draft.html#sec-string-constructor-string-value
>>
>> The motivation for this is that String(value) is pretty explicit and was
>> in ES5 a safer way to stringify something than value.toString().
>>
>> --
>> erik
>>
>>
>> +1. As I already noted last year [1], as currently specced, ad-hoc
>> debugging code like `alert("got argument: " + x)` or `alert("got argument:
>> " + String(x))` will throw for symbols, while `alert("got argument: " +
>> x.toString())` will throw for `null`, `undefined`, and
>> `Object.create(null)`.
>>
>> [1] http://esdiscuss.org/topic/a-new-es6-draft-is-available#content-11
>>
>>
>>
>
>
> --
> erik
>
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