How can I remove the decimal part from JavaScript number

Question

I have the results of a division and I wish to discard the decimal portion of the resultant number   How can I do this

User · Answer

Use Math round      Alex s answer is better  I made an assumption

User · Answer

u can also show a certain number of digit after decimal point here 2 digits  using following code     x000D   x000D  var num    15 46974  toFixed 2  x000D  console log num     15 47 x000D  console log typeof num     string x000D   x000D   x000D

User · Answer

You can use  toFixed 0  to remove complete decimal part or provide the number in arguments upto which you want decimal to be truncated   Note  toFixed will convert the number to string

User · Answer

If you don t care about rouding  just convert the number to a string  then remove everything after the period including the period   This works whether there is a decimal or not   const sEpoch      new Date      1000  toString    const formattedEpoch   sEpoch split      0

User · Answer

With ES2015  Math trunc   is available   Math trunc 2 3                           2 Math trunc -2 3                          -2 Math trunc 22222222222222222222222 3     2 2222222222222223e 22 Math trunc  2 3                          2 Math trunc  two                          NaN Math trunc NaN                           NaN   It s not supported in IE11 or below  but does work in Edge and every other modern browser

User · Answer

You can also use bitwise operators to truncate the decimal   e g   var x   9   2  console log x      4 5  x     x  console log x      4  x   -3 7 console log   x     -3 console log x   0     -3 console log x  lt  lt  0     -3   Bitwise operations are considerably more efficient than the Math functions  The double not bitwise operator also seems to slightly outperform the x   0 and x  lt  lt  0 bitwise operations by a negligible amount      952 milliseconds for  var i   0  i  lt  1000000  i           i   0 5    0        1150 milliseconds for  var i   0  i  lt  1000000  i           i   0 5   lt  lt  0        1284 milliseconds for  var i   0  i  lt  1000000  i          Math trunc i   0 5         939 milliseconds for  var i   0  i  lt  1000000  i             i   0 5       Also worth noting is that the bitwise not operator takes precedence over arithmetic operations  so you may need to surround calculations with parentheses to have the intended result   x   -3 7  console log   x   2     -6 console log x   2   0     -7 console log x   2  lt  lt  0     -7  console log    x   2      -7 console log x   2   0     -7 console log x   2  lt  lt  0     -7   More info about the double bitwise not operator can be found at Double bitwise NOT

User · Answer

Use Math round   function   Math round 65 98     will return 66  Math round 65 28     will return 65

User · Answer

You could also do   parseInt a b

User · Answer

You could use      Math trunc    truncate fractional part  also see below  Math floor    round down  Math ceil    round up   Math round    round to nearest integer       dependent on how you wanted to remove the decimal   Math trunc   isn t supported on all platforms yet  namely IE   but you could easily use a polyfill in the meantime   Another method of truncating the fractional portion with excellent platform support is by using a bitwise operator   e g  0   The side-effect of using a bitwise operator on a number is it will treat its operand as a signed 32bit integer  therefore removing the fractional component  Keep in mind this will also mangle numbers larger than 32 bits     You may also be talking about the inaccuracy of decimal rounding with floating point arithmetic    Required Reading - What Every Computer Scientist Should Know About Floating-Point Arithmetic

User · Answer

toFixed will behave like round   For a floor like behavior use     var num   3 834234  var floored num   num -  num   1      floored num will be 3

User · Answer

For an ES6 implementation  use something like the following   const millisToMinutesAndSeconds    millis    gt      const minutes   Math floor millis   60000     const seconds     millis   60000    1000  toFixed 0     return    minutes    seconds  lt  10    0         seconds

User · Answer

This is for those who want to prevent users to enter decimal numbers   lt input id  myInput  onkeyup  doSomething    type  number    gt    lt script gt      function doSomething              var intNum       myInput   val             if   Number isInteger intNum                 intNum   Math round intNum                      console log intNum          lt  script gt

User · Answer

For Example   var x   9 656  x toFixed 0                returns 10 x toFixed 2                returns 9 66 x toFixed 4                returns 9 6560 x toFixed 6                returns 9 656000    or  parseInt  10               returns 10 parseInt  10 33            returns 10 parseInt  10 20 30         returns 10 parseInt  10 years         returns 10 parseInt  years 10         returns NaN

User · Answer

Here is the compressive in detailed explanation with the help of above posts   1  Math trunc     It is used to remove those digits which are followed by dot  It converts implicitly  But  not supported in IE     Example   Math trunc 10 5     10  Math trunc -10 5     -10      Other Alternative way  Use of bitwise not operator   Example   x  5 5    x    5  2  Math floor     It is used to give the minimum integer value posiible  It is supported in all browsers   Example   Math floor 10 5     10  Math floor  -10 5     -11  3  Math ceil     It is used to give the highest integer value possible  It is supported in all browsers   Example   Math ceil 10 5     11  Math ceil -10 5     -10  4  Math round     It is rounded to the nearest integer  It is supported in all browsers   Example   Math round 10 5     11  Math round -10 5    -10  Math round 10 49     10  Math round -10 51     -11

[javascript] How can I remove the decimal part from JavaScript number?

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