Number or parseFloat

crmpicco · January 13th, 2006, 07:36 AM

Code:

noa = Number(df.noa.value);

or

Code:

noa = parseFloat(df.noa.value);

Which is the best to use here?

Picco

www.crmpicco.co.uk

vinod_yadav1919 · January 18th, 2006, 07:51 AM

Hii crmpicco!!!
In my case i use Number
since
parseFloat ->First character can be("." ,"+","-")or any number(0-9)
If it finds a character other than these (say at point p),it ignores that character and all succeeding characters and return the value up to that point P.

so whenever any non numeric number (say a,~,;) found in the parameter value it discarded from that location
e.g
a="-23.,34g" //or when form field contains (-23.,34g) as a input value
parseFloat(a) will return -23
a="2w3.34g" will return only 2
a="23g23" will give only 23

The same thing with parseInt
if first argument is started with "0x" it assumes it's a
hexadecimal value.
if started with 0 - not followed by an "x" - assumes as a octal value
so to avoid these problems use parseInt(string [,radix])

Hope this will help you

Cheers :)

vinod

crmpicco · January 18th, 2006, 10:05 AM

thanks Vinod, i'll be sure to use Number(var) from now on.............

www.crmpicco.co.uk

crmpicco · January 18th, 2006, 12:25 PM

which is heavier on processing? I dont have many occurancies in my script, but would like to know if Number causes the same "Compiler" problem as eval for example

www.crmpicco.co.uk

vinod_yadav1919 · January 19th, 2006, 12:42 AM

Hii Crmpicco!!!
I use regular expressions to check for valid number,float,negative numbers.
Offcourse regular expression executes faster,I think so.

Hope this will help you

Cheers :)

vinod

crmpicco · March 21st, 2006, 01:03 PM

Quote:

quote:parseInt(string [,radix])

you mention radix? is this an 'option'?

www.crmpicco.co.uk

joefawcett · March 21st, 2006, 01:18 PM

You should always specify radix when using parseInt otherwise you can get some strange results with "09" etc.
personally for integers I use Math.floor().

--

Joe (Microsoft MVP - XML)