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Groups > comp.lang.javascript > #39180

Re: Writing type conversions

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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"

x = 4;
y = x + 2;

y will be the number 6


-- 
Arno Welzel
https://arnowelzel.de

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Re: Writing type conversions John G Harris <niam@jghnorth.org.uk.invalid> - 2020-11-23 18:34 +0000
  Re: Writing type conversions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-23 20:11 +0000
    Re: Writing type conversions Arno Welzel <usenet@arnowelzel.de> - 2020-11-24 09:49 +0100
      Re: Writing type conversions Silvio <silvio@internet.com> - 2020-11-24 10:58 +0100
        Re: Writing type conversions Arno Welzel <usenet@arnowelzel.de> - 2020-11-24 18:56 +0100
      Re: Writing type conversions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-24 11:48 +0000
    Re: Writing type conversions John G Harris <niam@jghnorth.org.uk.invalid> - 2020-11-24 18:34 +0000
      Re: Writing type conversions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-24 21:56 +0000
        Re: Writing type conversions John G Harris <niam@jghnorth.org.uk.invalid> - 2020-11-25 15:32 +0000
          Re: Writing type conversions Julio Di Egidio <julio@diegidio.name> - 2020-11-25 10:29 -0800
          Re: Writing type conversions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-11-25 19:58 +0000
            Re: Writing type conversions Julio Di Egidio <julio@diegidio.name> - 2020-11-26 16:47 -0800
  Re: Writing type conversions Arno Welzel <usenet@arnowelzel.de> - 2020-11-24 09:56 +0100

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