Use Javascript to change a decimal to a whole number

Question

If I have some JS:

 var ct = 1.30;

or it could also be:

 var ct = 0.04;

or it could also be:

 var ct = 4.45677;

How can I simply change these decimals to whole numbers? i.e.:

for the first one

for the second one and

for the 3rd one?

Is there a JS method I can use to do this?

Here is the code I am working with so far. This works fine for seconds, minutes and hours, but I am left without the frames, which is why I started the process in the first place.

  var ct2 = 1.30;

  var timestamp = ct2; 
  var seconds = timestamp % 60;
 timestamp = Math.floor(timestamp / 60);
 var minutes = timestamp % 60;
 timestamp = Math.floor(timestamp / 60);
 var hours = timestamp;

This ends up giving me:

Seconds: 1

Minutes: 0

Hours: 0

But leaves me without this key part:

Frames: 30

How is it that 1.30 somehow converts to 30 and 0.04 somehow converts to 4? — musical_coder
– musical_coder, Commented Feb 3, 2015 at 6:16
multiply them by 10 and mod them..? what are you trying to do — bryce
– bryce, Commented Feb 3, 2015 at 6:17
You have to write your own method. There is no direct method available to cater your requirement. — Rumesh Eranga Hapuarachchi
– Rumesh Eranga Hapuarachchi, Commented Feb 3, 2015 at 6:17
You probably want the fractional part rounded upto two decimal places? You'll have to create your own method and deal with the inconsistencies of floating points! — nyumerics
– nyumerics, Commented Feb 3, 2015 at 6:20
@musical_coder: My video player is giving me the see point in the video as a whole number and a decimal, but I have to figure out how to convert this into a timestamp, i.e. 00:00:01:30. So, instead of the decimal .30, I simply need the number to be 30, so I can string the digits together to create the timestamp. I don't really care how it happens, as long as it happens. — CRAIG
– CRAIG, Commented Feb 3, 2015 at 6:20

jdphenix · Accepted Answer · 2015-02-03 06:30:38Z

2

Based on your example numbers given, this function would meet the output requirements you've given. (I'm not sure exactly what it is you're doing, so I called it foo.

var foo = function (num) { 
  num -= Math.trunc(num); 
  num *= 100; 
  return Math.round(num); 
}

Example output:

var ct1 = 0.04, 
    ct2 = 1.30,
    ct3 = 4.45677; 

console.log(foo(ct1)); 
console.log(foo(ct2));
console.log(foo(ct3)); 

>  4
>  30
>  46

answered Feb 3, 2015 at 6:30

jdphenix

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1 Comment

CRAIG Over a year ago

There ya go! That's what I'm talking about. Works like a charm. Thanks for adding the example output as well. Still being a JS newb in many respects, the first part had me a little stumped, but the Example definitely helped me move beyond. Thanks for that.

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