get the value after decimal point in javascript

Question

I have a javascript number 12.1542. and I want the new string 12.(1542*60) from this string.

How can I get it. Thanks

Should the new string be 12.92520 or "12.(1542*60)" (literally)? — Salman Arshad
– Salman Arshad, Commented Mar 15, 2012 at 7:50

James Allardice · Accepted Answer · 2012-03-15 07:58:22Z

29

var num = 12.1542;
console.log(num % 1);

However, due to the nature of floating point numbers, you will get a number that is very slightly different. For the above example, Chrome gives me 0.15419999999999945.

Another (slightly longer) option would be to use Math.floor and then subtract the result from the original number:

var num = 12.1542;
console.log(num - Math.floor(num));

Again, due to the nature of floating point numbers you will end up with a number that is very slightly different than you may expect.

edited Mar 15, 2012 at 7:58

answered Mar 15, 2012 at 7:49

James Allardice

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1 Comment

Roy Shoa Over a year ago

You can also use toFixed(X) fix the number: console.log((num - Math.floor(num)).toFixed(2));

Sirko · Accepted Answer · 2012-03-15 07:55:16Z

1

Input sanity checks aside, this should work:

var str = '12.1542';
var value = Math.floor( str ) + ( 60 * (str - Math.floor( str ) ) );

edited Mar 15, 2012 at 7:55

answered Mar 15, 2012 at 7:50

Sirko

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2 Comments

James Allardice Over a year ago

You are missing a closing parenthesis, but if you add it in, this results in 21.251999999999967, which I don't think is what the OP is looking for.

Sirko Over a year ago

Thx. Added the parenthesis. I think, almost nobody here is completly sure, what the op really wants :-)

Teemu · Accepted Answer · 2012-03-15 08:15:56Z

1

Time to decimals:

function toDec(sec){
    var itg=Math.floor(sec);
    sec=(sec-itg)*60;
    return itg+sec; // OR: return new String(itg+sec);
}

edited Mar 15, 2012 at 8:15

answered Mar 15, 2012 at 8:04

Teemu

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Comments

Nicolas Modrzyk · Accepted Answer · 2012-03-15 07:47:56Z

0

floor is probably the method to get what you want:

http://www.w3schools.com/jsref/jsref_floor.asp

You could also use ceil

http://www.w3schools.com/jsref/jsref_obj_math.asp

answered Mar 15, 2012 at 7:47

Nicolas Modrzyk

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2 Comments

James Allardice Over a year ago

This would get you the part before the decimal point, not after.

Nicolas Modrzyk Over a year ago

@limelights: good point. developer.mozilla.org/en/JavaScript/Reference/Global_Objects/…

Kashan Haider · Accepted Answer · 2019-11-26 17:54:30Z

0

let Decimal = "12.56"

Decimal.substring(Decimal.indexOf(".")+1, Decimal .length)

// answer is 56.

answered Nov 26, 2019 at 17:54

Kashan Haider

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