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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.lang.javascript
Subject: Re: Writing type conversions
Date: Tue, 24 Nov 2020 18:56:29 +0100
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Silvio:

> On 11/24/20 9:49 AM, Arno Welzel wrote:
>> Ben Bacarisse:
>>
>>> John G Harris <niam@jghnorth.org.uk.invalid> writes:
>>>
>>>> On 23 Nov 2020 12:29:27 GMT, ram@zedat.fu-berlin.de (Stefan Ram)
>>>> wrote:
>>>>
>>>>    <snip>
>>>>>   However, in the Java world many deemed »+ ""« to be bad
>>>>>   style because it does not express the intent of the
>>>>>   programmer to convert something to a string but would
>>>>>   mystify the reader. I do not share this point of view,
>>>>>   however, because I think the intent of »+ ""« is clear.
>>>>
>>>>    "" + x + 1
>>>> makes it more obvious.
>>>
>>> Am I missing a joke?  (It does something else altogether.)
>>
>> No - this is not a joke. Since JavaScript is loosely typed, the
>> expression "" + x + 1 is totally valid and will always create a string
>> as result - so having "" in the beginning makes this more visible.
>> However, the result value depends on wether x is a string not not.
>>
>> x = "4";
>> y = "" + x + 2;
>>
>> y will be the string "42"
>>
>> x = 4;
>> y = "" + x + 2;
>>
>> y will be the string "6"
> 
> Think again...

I stand corrected - the result is "42" in both cases of course.



-- 
Arno Welzel
https://arnowelzel.de