String.prototype.repeat

David Bruant david.bruant at labri.fr
Tue Mar 22 14:18:05 PDT 2011


Le 22/03/2011 02:39, Dmitry A. Soshnikov a écrit :
> On 22.03.2011 23:42, David Bruant wrote:
>> Hi,
>>
>> About the string_repeat strawman
>> (http://wiki.ecmascript.org/doku.php?id=strawman:string_repeat), one
>> alternative solution could be a two argument constructor. Something
>> like: String(n, pattern). So, for the example in the strawman, it
>> would be String(3, '*').
>
> A little bit off-topic, but not so big off-topic. Recently on Twitter
> there was a question why it's not an array of zeros:
>
> Array(100).map(function() { return 0; }); // not the array of zeros
It's not that much off-topic. I have made the mistake myself facing this
issue :-) (https://bugs.ecmascript.org/show_bug.cgi?id=33#c6)

> the answer is known of course (there's no any property in the created
> array), but similary to your String(n, '*'), there can be also
> Array.fill(100, 0); or Array.init(100, 0);
>
> P.S.: though, of course all these can be done manually in ES itself.
Of course and these cases do not happen once a day. However, when they
happen, it's convenient if the language offers a native construct.

David

>
> Dmitry.
>
>> In ES5, the String constructors (String and new String) both are
>> expected to be used with zero or one argument, so using a two
>> argument constructor should not break the web or people's expectations.
>>
>> David

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