adding

[Stuart]

I am occasionally having problems with adding numbers together. Sometimes
(not always) 2 + 2 = 22, Obviousy this is a string issue. I am using the
following method to overcome this problem, however I feel it is a bit
contrived, and i am sure there is a proper way of doing it!

var asd = 2
var zxc=2
asd=asd-(-1*zxc)

[Lasse Reichstein Nielsen]

Re: adding

"Stuart" <kffgtr@yytd.gf t> writes:
[color=blue]
> I am occasionally having problems with adding numbers together. Sometimes
> (not always) 2 + 2 = 22, Obviousy this is a string issue. I am using the
> following method to overcome this problem, however I feel it is a bit
> contrived, and i am sure there is a proper way of doing it![/color]

<URL:http://jibbering.com/faq/#FAQ4_21>

/L
--
Lasse Reichstein Nielsen - lrn@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

[Svend Ezaki Tofte (DIKU)]

Re: adding

On Wed, 5 Nov 2003, Stuart wrote:
[color=blue]
> I am occasionally having problems with adding numbers together. Sometimes
> (not always) 2 + 2 = 22, Obviousy this is a string issue. I am using the
> following method to overcome this problem, however I feel it is a bit
> contrived, and i am sure there is a proper way of doing it![/color]

If I want to force conversion, and I'm lazy, I go:

baz = 0 + foo + bar;

It's the same ideas as when you want to turn stuff into a string:

baz = "" + foo + bar;

But in general, 2 + 2 should /never/ give you 22. Unless you're pulling
the numbers from, say a input box (in which case you're pulling text!)

Regards,
Svend

[Lasse Reichstein Nielsen]

Re: adding

"Svend Ezaki Tofte (DIKU)" <di030271@diku. dk> writes:
[color=blue]
> If I want to force conversion, and I'm lazy, I go:
>
> baz = 0 + foo + bar;[/color]

That would be *too* lazy.

var foo="2", bar="2";
alert(0 + foo + bar);

This alerts "022". The type concversion favors strings over numbers,
so when you add a string to a number, the number is converted to a
string, not the other way around. The order doesn't matter.

Just do as the FAQ says :) The fastest method is the unary prefix
plus.
var baz = +foo + +bar;
<URL:http://jibbering.com/faq/#FAQ4_21>
[color=blue]
> It's the same ideas as when you want to turn stuff into a string:
>
> baz = "" + foo + bar;[/color]

Which works, because the string wins, and evaluation is left to right.

/L
--
Lasse Reichstein Nielsen - lrn@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

[Dr John Stockton]

Re: adding

JRS: In article <Pine.LNX.4.58. 0311060627360.1 9360@brok.diku. dk>, seen
in news:comp.lang. javascript, Svend Ezaki Tofte (DIKU)
<di030271@diku. dk> posted at Thu, 6 Nov 2003 06:29:23 :-[color=blue]
>On Wed, 5 Nov 2003, Stuart wrote:
>[color=green]
>> I am occasionally having problems with adding numbers together. Sometimes
>> (not always) 2 + 2 = 22, Obviousy this is a string issue. I am using the
>> following method to overcome this problem, however I feel it is a bit
>> contrived, and i am sure there is a proper way of doing it![/color]
>
>If I want to force conversion, and I'm lazy, I go:
>
>baz = 0 + foo + bar;[/color]

That's a nice easy method; the only fault, as far as I can see, is that
it does not work.

Tested solutions are safer.

Read the FAQ.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> JS maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/JS/&c., FAQ topics, links.