Remove decimal separator in javascript

const decimal = 5.67567;

const removedDecimal = Math.trunc[decimal];
// returns 5

const removedDecimal = parseInt[decimal];
// returns 5

const removedDecimal = Math.round[decimal];
// returns 5

decimal.toFixed[];
// return 6

decimal.toFixed[2]
// returns 5.68

decimal.toFixed[1]
// return 5.7

ok i know this is probably really easy but I am floundering.. I have a series of variables that have a decimal point and a few zeros. How do I strip the variable so it goes from 1.000 to 1 ? Dont think this is that important but the numbers are generated from an xml file that I am grabbing with jquery like ...

var quantity = $["QTY",this].text[];

Thanks in advance for any help!

asked Apr 11, 2011 at 23:34

1

Simply...

Math.round[quantity];

...assuming you want to round 1.7 to 2. If not, use Math.floor for 1.7 to 1.

answered Apr 11, 2011 at 23:38

mVChrmVChr

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use parseInt[];

parseInt["1.25"];//returns 1
parseInt["1.85"];//returns 1
parseInt[1.25];//returns 1
parseInt[1.85];//returns 1

answered Apr 11, 2011 at 23:38

dannieldanniel

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1

Use number = ~~number

This is the fastest substitute to Math.floor[]

answered Apr 24, 2015 at 6:23

AshishAshish

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4

parseInt is the slowest method math.floor is the 2nd slowest method

faster methods not listed here are:

var myInt = 1.85 | 0; myInt = 1;

var myInt = 1.85 >> 0; myInt = 1;

Speed tests done here: //jsperf.com/math-floor-vs-math-round-vs-parseint/2

answered May 14, 2013 at 7:55

ValentineValentine

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1

answered Dec 2, 2017 at 14:17

1

For rounding numbers to the nearest Integer you can use Math.round[] like so:

Math.round["1.000"]; // Will produce 1
Math.round[123.4234]; // Will produce 123

answered Apr 11, 2011 at 23:41

KushalPKushalP

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You don't need jQuery for this.

You can use parseInt just fine. From the page:

document.write[parseInt["10.33"] + "
"]; // 10

answered Apr 11, 2011 at 23:38

KhezKhez

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Here's another nice example:

I often use Math.round and toLocateString to convert numbers containing decimal places, into a more readable string, with thousand separators:

var myNumberAsString = "1234567.890123"              //  "1234567.890123"
var myNumber = Math.round[0.0 + myNumberAsString];   //  1234568
return myNumber.toLocaleString[];                    //  "1,234,568"

I find this useful when loading decimal values from, say a JSON Web Service, and need to display them in a friendlier format on a web page [when, of course, I don't need to display all of the decimal places].

answered Nov 3, 2014 at 13:25

Mike GledhillMike Gledhill

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A faster, more efficient way would be to use JavaScript's bitwise operators, like so:

function stripDecimals[n] {
     return n | 0;
}

// examples:
stripDecimals[23.245]; // => 23
stripDecimals[100.015020]; // => 100

The | [OR operator] will treat the numbers as 32-bit [binary 0s and 1s], followed by returning the desired result depending on the operands, which in this case would result to an integer stripped of all decimal places.

answered Mar 11, 2018 at 17:08

MysticalMystical

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I suggest you use something called Math.trunc[]... put your number in the parentheses. The reason I don't suggest you use Math.round[] is that it might change the integer part of your decimal number which some people won't want though you can use Math.round[] if you know you want to get the closest integer.

answered Sep 9, 2019 at 10:48

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