Length of a number in javascript. 4

[borntorun]

Hi,

I need to test if a number has a decimal point and count the characters before the decimal point. Obviously without a decimal point i can just do length.

Thanks.

 

[LFI]

myString.indexOf(characterOrStringOfInterest)

...will return the 0-based index of the start of the parameter in the string. If it is not present at all, it returns -1.

If it's not -1, then you can use the substring function, setting the first parameter to 0 (start of the string) and the second/last parameter to the index of the decimal you've found.

Is that enough to go on?

Dave


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[cLFlaVA]

one way (untested):

var num = 12345.67;
var str = num + "";
var len = str.split(".")[0].length;
alert(len);

*cLFlaVA
----------------------------
[tt]I already made like infinity of those at scout camp...[/tt]
[URL unfurl="true"]http://www.coryarthus.com/[/url]

 

[LFI]

Cory,

I think you woke up outside the box this morning!

Dave


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[BillyRayPreachersSon]

This is pretty much the same as cLFlaVA's, but using the toString method inherent to all Number objects:

var someNum = 123;
alert(someNum.toString().split('.')[0].length);
someNum = 12345.67
alert(someNum.toString().split('.')[0].length);

Dan

[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]

 

[kaht]

I must be outside the box too because that's pretty much what I would have typed up too

-kaht

_{<P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <.</B>}

 

[LFI]

I guess your solutions are better because they don't require testing for the existence of the decimal first. I see...

[yoda voice]Wise beyond your years, you are.[/yoda voice]

Dave


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[cLFlaVA]

yeah man, last night's dinner was terrible. i was definitely forced to sleep outside the box, therefore, that's where i woke up.



*cLFlaVA
----------------------------
[tt]I already made like infinity of those at scout camp...[/tt]
[URL unfurl="true"]http://www.coryarthus.com/[/url]

 

[BillyRayPreachersSon]

Take away Chinese again, Cory?




[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]

 

[cLFlaVA]

pickles and cheese on wheat.

should have suggested chinese earlier, Dan.

oh well, next year!



*cLFlaVA
----------------------------
[tt]I already made like infinity of those at scout camp...[/tt]
[URL unfurl="true"]http://www.coryarthus.com/[/url]

 

[BabyJeffy]

Can I have a star, please?

Cheers,
Jeff

[tt]Jeff's Page @ Code Couch

http://www.codecouch.com/jeff/

http://www.codecouch.com/jeff/blog/

[/tt]

What is Javascript? FAQ216-6094

 

[LFI]

Would you settle for David Hasselhoff?


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[BabyJeffy]

Harsh!

[tt]Jeff's Page @ Code Couch

http://www.codecouch.com/jeff/

http://www.codecouch.com/jeff/blog/

[/tt]

What is Javascript? FAQ216-6094

 

[cLFlaVA]

ahhh, just what the doctor ordered:

http://www.youtube.com/watch?v=Gi2CfuqcUGE

*cLFlaVA
----------------------------
[tt]I already made like infinity of those at scout camp...[/tt]
[URL unfurl="true"]http://www.coryarthus.com/[/url]

 

[BillyRayPreachersSon]

I can't believe that video ever saw the light of day!



[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]

 

[LFI]

I don't have sound on my computer at work, but I am laughing just the same!




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[Tarwn]

Aw man, you guys missed the other way:

var someNum = 123.456
alert((Math.floor(someNum)).toString().length);

And some recursion is great for the diet :

function intCount(aNum){
   return (abs(aNum) >= 1)?1 + intCount(aNum/10):0;
}

 

[cLFlaVA]

And some recursion is great for the diet

don't you mean regurgitation?



*cLFlaVA
----------------------------
[tt]I already made like infinity of those at scout camp...[/tt]
[URL unfurl="true"]http://www.coryarthus.com/[/url]