Generating random whole numbers in JavaScript in a specific range

Question

How can I generate random whole numbers between two specified variables in JavaScript  e g  x   4 and y   8 would output any of 4  5  6  7  8

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Write a function called randUpTo that accepts a number and returns a   random whole number between 0 and that number      var randUpTo   function num        return Math floor Math random      num - 1    0            Write a function called randBetween that accepts two numbers   representing a range and returns a random whole number between those two   numbers      var randBetween   function  min  max        return Math floor Math random      max - min - 1     min           Write a function called randFromTill that accepts two numbers   representing a range and returns a random number between min  inclusive    and max  exclusive       var randFromTill   function  min  max        return Math random      max - min    min           Write a function called randFromTo that accepts two numbers   representing a range and returns a random integer between min  inclusive    and max  inclusive      var randFromTo   function  min  max        return Math floor Math random      max - min   1     min

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random min max  generates a random number between min  inclusive  and max  exclusive  Math floor rounds a number down to the nearest integer  function generateRandomInteger  min  max         return Math floor random min max          So to generate a random integer between 4 and 8 inclusive  call the above function with the following arguments   generateRandomInteger  4 9

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All these solution are using way too much firepower  you only need to call one function  Math random     Math random     max   0   this returns a random int between 0 inclusive  and max  non-inclusive

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this is my take on a random number in a range  as in I wanted to get a random number within a range of base to exponent   e g  base   10  exponent   2  gives a random number from 0 to 100  ideally  and so on   if it helps use it  here it is      get random number within provided base   exponent    by Goran Biljetina -- gt  2012  function isEmpty value       return  typeof value      undefined     value     null     var numSeq   new Array    function add num seq       var toAdd   new Object         toAdd num   num       toAdd seq   seq       numSeq numSeq length    toAdd    function fillNumSeq  num seq       var n      for i 0 i lt  seq i             n   Math pow num i           add n i           function getRandNum base exp       if  isEmpty base            console log  Specify value for base parameter              if  isEmpty exp            console log  Specify value for exponent parameter              fillNumSeq base exp       var emax      var eseq      var nseed      var nspan      emax    numSeq length       eseq   Math floor Math random   emax  1      nseed   numSeq eseq  num      nspan   Math floor  Math random     Math random   nseed   1      return Math floor Math random   nspan  1     console log getRandNum 10 20  numSeq     testing    getRandNum -10 20     console log getRandNum -10 20  numSeq     console log numSeq

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Math random   is fast and suitable for many purposes  but it s not appropriate if you need cryptographically-secure values  it s not secure   or if you need integers from a completely uniform unbiased distribution  the multiplication approach used in others answers produces certain values slightly more often than others    In such cases  we can use crypto getRandomValues   to generate secure integers  and reject any generated values that we can t map uniformly into the target range  This will be slower  but it shouldn t be significant unless you re generating extremely large numbers of values   To clarify the biased distribution concern  consider the case where we want to generate a value between 1 and 5  but we have a random number generator that produces values between 1 and 16  a 4-bit value   We want to have the same number of generated values mapping to each output value  but 16 does not evenly divide by 5  it leaves a remainder of 1  So we need to reject 1 of the possible generated values  and only continue when we get one of the 15 lesser values that can be uniformly mapped into our target range  Our behaviour could look like this pseudocode   Generate a 4-bit integer in the range 1-16  If we generated  1   6  or 11 then output 1  If we generated  2   7  or 12 then output 2  If we generated  3   8  or 13 then output 3  If we generated  4   9  or 14 then output 4  If we generated  5  10  or 15 then output 5  If we generated 16 then reject it and try again    The following code uses similar logic  but generates a 32-bit integer instead  because that s the largest common integer size that can be represented by JavaScript s standard number type   This could be modified to use BigInts if you need a larger range   Regardless of the chosen range  the fraction of generated values that are rejected will always be less than 0 5  so the expected number of rejections will always be less than 1 0 and usually close to 0 0  you don t need to worry about it looping forever    x000D   x000D  const randomInteger    min  max    gt    x000D    const range   max - min  x000D    const maxGeneratedValue   0xFFFFFFFF  x000D    const possibleResultValues   range   1  x000D    const possibleGeneratedValues   maxGeneratedValue   1  x000D    const remainder   possibleGeneratedValues   possibleResultValues  x000D    const maxUnbiased   maxGeneratedValue - remainder  x000D   x000D    if   Number isInteger min      Number isInteger max     x000D         max  gt  Number MAX SAFE INTEGER    min  lt  Number MIN SAFE INTEGER    x000D      throw new Error  Arguments must be safe integers     x000D      else if  range  gt  maxGeneratedValue    x000D      throw new Error  Range of   range   from   min  to   max    gt    maxGeneratedValue      x000D      else if  max  lt  min    x000D      throw new Error  max    max   must be  gt   min    min       x000D      else if  min     max    x000D      return min  x000D       x000D   x000D    let generated  x000D    do   x000D      generated   crypto getRandomValues new Uint32Array 1   0   x000D      while  generated  gt  maxUnbiased   x000D   x000D    return min    generated   possibleResultValues   x000D     x000D   x000D  console log randomInteger -8  8                -2 x000D  console log randomInteger 0  0                 0 x000D  console log randomInteger 0  0xFFFFFFFF        944450079 x000D  console log randomInteger -1  0xFFFFFFFF    x000D     Error  Range of 4294967296 covering -1 to 4294967295 is  gt  4294967295  x000D  console log new Array 12  fill   map n   gt  randomInteger 8  12     x000D      11  8  8  11  10  8  8  12  12  12  9  9  x000D   x000D   x000D

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For a random integer with a range  try   function random minimum  maximum      var bool   true     while  bool        var number    Math floor Math random     maximum   1    minimum       if  number  gt  20          bool   true        else         bool   false               return number

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After generating a random number using a computer program  it is still consider as a random number if the picked number is a part or the full one of the initial one  But if it was changed  then mathematicians are not accept it as a random number and they can call it a biased number  But if you are developing a program for a simple task  this will not be a case to consider  But if you are developing a program to generate a random number for a valuable stuff such as lottery program  or gambling game  then your program will be rejected by the management if you are not consider about the above case   So for those kind of people  here is my suggestion   Generate a random number using Math random    say this n   Now for  0 10     gt   n 10  i e  one digit  and for 10 100     gt  n 100  i e  two digits  and so on  Here squire bracket indicates that boundary is inclusive and round bracket indicates boundary is exclusive  Then remove the rest after the decimal point   i e  get floor  - using Math floor    this can be done    If you know how to read random number table to pick a random number  you know above process multiplying by 1  10  100 and so on  is not violates the one that I was mentioned at the beginning   Because it changes only the place of the decimal point    Study the following example and develop it to your needs   If you need a sample  0 9  then floor of n 10 is your answer and if need  0 99  then floor of n 100 is your answer and so on   Now let enter into your role   You ve asked numbers among specific range   In this case you are biased among that range  - By taking a number from  1 6  by roll a die  then you are biased into  1 6  but still it is a random if and only if die is unbiased    So consider your range      78  247  number of elements of the range   247 - 78   1   170   since both the boundaries are inclusive     Mthod 1        var i   78  j   247  k   170  a       b       c  d  e  f  l   0      for   i  lt   j  i     a push i         while l  lt  170           c   Math random   100  c   Math floor c           d   Math random   100  d   Math floor d           b push a c    e   c   d          if  b length    k   amp  amp   e  lt  k     b push a e              l   b length            console log  Method 1         console log b     Method 2         var a  b  c  d       l   0      while l  lt  170           a   Math random   100  a   Math floor a           b   Math random   100  b   Math floor b           c   a   b          if c  lt   247    c  gt   78   d push c    else  d push a             l   d length            console log  Method 2         console log d     Note  In method one  first I created an array which contains numbers that you need and then randomly put them into another array  In method two  generate numbers randomly and check those are in the range that you need  Then put it into an array  Here I generated two random numbers and used total of them to maximize the speed of the program by minimizing the failure rate that obtaining a useful number  However adding generated numbers will also give some biassness  So I would recommend my first method to generate random numbers within a specific range   In both methods  your console will show the result  Press f12 in Chrome to open the console

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function getRandomInt lower  upper          to create an even sample distribution     return Math floor lower    Math random      upper - lower   1            to produce an uneven sample distribution       return Math round lower    Math random      upper - lower            to exclude the max value from the possible values       return Math floor lower    Math random      upper - lower         To test this function  and variations of this function  save the below HTML JavaScript to a file and open with a browser   The code will produce a graph showing the distribution of one million function calls   The code will also record the edge cases  so if the the function produces a value greater than the max  or less than the min  you will know about it    lt html gt       lt head gt           lt script type  text javascript  gt          function getRandomInt lower  upper                          to create an even sample distribution             return Math floor lower    Math random      upper - lower   1                    to produce an uneven sample distribution               return Math round lower    Math random      upper - lower                    to exclude the max value from the possible values               return Math floor lower    Math random      upper - lower                        var min   -5          var max   5           var array   new Array             for var i   0  i  lt    max - min    2  i                array push 0                      for var i   0  i  lt  1000000  i                  var random   getRandomInt min  max               array random - min   1                        var maxSample   0          for var i   0  i  lt  max - min  i                  maxSample   Math max maxSample  array i                         create a bar graph to show the sample distribution         var maxHeight   500          for var i   0  i  lt    max - min    2  i                  var sampleHeight    array i  maxSample    maxHeight               document write   lt span style  display inline-block color    sampleHeight    0    black     white     background-color black height   sampleHeight  px  gt  amp nbsp       i   min - 1        amp nbsp   array i    lt  span gt  amp nbsp  amp nbsp                       document write   lt hr  gt              lt  script gt       lt  head gt       lt body gt        lt  body gt   lt  html gt

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lt  DOCTYPE html gt   lt html gt       lt head gt               lt meta charset  utf-8    gt       lt  head gt       lt body gt           lt script gt                                  assuming that window crypto getRandomValues is available                 the real range would be fron 0 to 1 998 instead of 0 to 2 000                 See javascript documentation for explanation                 https   developer mozilla org en-US docs Web API RandomSource getRandomValues                            var array   new Uint8Array 2               window crypto getRandomValues array               console log array 0    array 1              lt  script gt       lt  body gt   lt  html gt    Uint8Array create a array filled with a number up to 3 digits which would be a maximum of 999  This code is very short

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For best performance  you can simply use   var r    Math random      maximum - minimum   1     lt  lt  0

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Ionu  G  Stan wrote a great answer but it was a bit too complex for me to grasp  So  I found an even simpler explanation of the same concepts at https   teamtreehouse com community mathfloor-mathrandom-max-min-1-min-explanation by Jason Anello   NOTE  The only important thing you should know before reading Jason s explanation is a definition of  truncate   He uses that term when describing Math floor    Oxford dictionary defines  truncate  as      Shorten  something  by cutting off the top or end

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Here s what I use to generate random numbers   function random high low        high        return Math floor  Math random     high-low   low      We do execute high   becauseMath random   generates a random number between 0   inclusive   and 1 exclusive  The one being excluded  means we must increase the high by one before executing any math  We then subtract low from high  giving us the highest number to generate - low  then  low  bringing high back to normal  and making the lowest number atleast low  then we return the resulting number  random 7 3  could return 3 4 5 6  or 7

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Return a random number between 1 and 10   Math floor  Math random   10    1      Return a random number between 1 and 100   Math floor  Math random   100    1

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Problems with the accepted answer It s worth noting that the accepted answer does not properly handle cases where min is greater than max  Here s an example of that   x000D   x000D  min   Math ceil 2   max   Math floor 1   for var i   0  i  lt  25  i        console log Math floor Math random      max - min   1     min     x000D   x000D   x000D   In addition  it s a bit wordy and unclear to read if you re unfamiliar with this little algorithm  Why is Randojs a better solution  Randojs handles cases where min is greater than max automatically  and it s cryptographically secure    x000D   x000D  for var i   0  i  lt  25  i    console log rando 2  1    x000D   lt script src  https   randojs com 1 0 0 js  gt  lt  script gt  x000D   x000D   x000D   It also handles negatives  zeros  and everything else you d expect  If you need to do floats or use other variable types  there are options for that as well  but I won t talk about them here  They re on the site so you can delve deeper there if needed  The final reason is pretty obvious  Stylistically  it s is much cleaner and easier to read   TL DR  Just give me the solution    randojs com makes this and a ton of other common randomness stuff robust  reliable  as simple readable as this   x000D   x000D  console log rando 20  30    x000D   lt script src  https   randojs com 1 0 0 js  gt  lt  script gt  x000D   x000D   x000D

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function getRandomizer bottom  top        return function             return Math floor  Math random       1   top - bottom       bottom            usage   var rollDie   getRandomizer  1  6     var results      for   var i   0  i lt 1000  i           results    rollDie               make a string filled with 1000 random numbers in the range 1-6      breakdown    We are returning a function  borrowing from functional programming  that when called  will return a random integer between the the values bottom and top  inclusive  We say  inclusive  because we want to include both bottom and top in the range of numbers that can be returned  This way  getRandomizer  1  6   will return either 1  2  3  4  5  or 6     bottom is lower number  top is greater number   Math random       1   top - bottom     Math random   returns a random double between 0 and 1  and if we multiply it by one plus the difference between top and bottom  we ll get a double somewhere between 0 and 1 b-a    Math floor  Math random       1   top - bottom       Math floor rounds the number down to the nearest integer  So we now have all the integers between 0 and top-bottom  The 1 looks confusing  but it needs to be there because we are always rounding down  so the top number will never actually be reached without it  The random decimal we generate needs to be in the range 0 to  1 top-bottom  so we can round down and get an int in the range 0 to top-bottom  Math floor  Math random       1   top - bottom       bottom   The code in the previous example gave us an integer in the range 0 and top-bottom  so all we need to do now is add bottom to that result to get an integer in the range bottom and top inclusive   D    NOTE  If you pass in a non-integer value or the greater number first you ll get undesirable behavior  but unless anyone requests it I am not going to delve into the argument checking code as its rather far from the intent of the original question

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You can you this code snippet   let randomNumber   function first second   let number   Math floor Math random   Math floor second    while number lt first        number   Math floor Math random   Math floor second      return number

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Using modern JavaScript   Lodash const generateRandomNumbers    max  amount    gt      const numbers       Array max  keys       const randomNumbers   sampleSize numbers  amount      return randomNumbers sort  a  b    gt  a - b       Also  typescript version const generateRandomNumbers    max  number  amount  number    gt      const numbers       Array max  keys       const randomNumbers  number     sampleSize numbers  amount      return randomNumbers sort  a  number  b  number    gt  a - b

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Crypto-Strong  To get crypto-strong random integer number in ragne  x y  try   x000D   x000D  let cs   x y   gt x  y-x 1  crypto getRandomValues new Uint32Array 1   0  2  32 0 x000D   x000D  console log cs 4 8   x000D   x000D   x000D

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My method of generating random number between 0 and n  where n  lt   10  n excluded    Math floor  Math random     10    n

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Here is the MS DotNet Implementation of Random class in javascript-  var Random    function      function Random Seed        if   Seed            Seed   this milliseconds              this SeedArray           for  var i   0  i  lt  56  i            this SeedArray push 0       var num    Seed    -2147483648    2147483647   Math abs Seed       var num2   161803398 - num      this SeedArray 55    num2      var num3   1      for  var i 1   1  i 1  lt  55  i 1              var num4   21   i 1   55          this SeedArray num4    num3          num3   num2 - num3          if  num3  lt  0                num3    2147483647                    num2   this SeedArray num4             for  var j   1  j  lt  5  j              for  var k   1  k  lt  56  k                  this SeedArray k  -  this SeedArray 1    k   30    55               if  this SeedArray k   lt  0                    this SeedArray k     2147483647                                    this inext   0      this inextp   21      Seed   1    Random prototype milliseconds   function          var str   new Date   valueOf   toString        return parseInt str substr str length - 6       Random prototype InternalSample   function          var num   this inext      var num2   this inextp      if    num  gt   56            num   1            if    num2  gt   56            num2   1            var num3   this SeedArray num  - this SeedArray num2       if  num3    2147483647            num3--            if  num3  lt  0            num3    2147483647            this SeedArray num    num3      this inext   num      this inextp   num2      return num3     Random prototype Sample   function          return this InternalSample     4 6566128752457969E-10     Random prototype GetSampleForLargeRange   function          var num   this InternalSample        var flag   this InternalSample     2    0      if  flag            num   -num            var num2   num      num2    2147483646 0      return num2   4294967293 0     Random prototype Next   function  minValue  maxValue        if   minValue  amp  amp   maxValue          return this InternalSample        var num   maxValue - minValue      if  num  lt   2147483647            return parseInt  this Sample     num   minValue  toFixed 0              return this GetSampleForLargeRange     num   minValue     Random prototype NextDouble   function          return this Sample       Random prototype NextBytes   function  buffer        for  var i   0  i  lt  buffer length  i              buffer i    this InternalSample     256           return Random          Use           var r   new Random            var nextInt   r Next 1  100     returns an integer between range         var nextDbl   r NextDouble      returns a random decimal

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Here is an example of a javascript function that can generate a random number of any specified length without using Math random         function genRandom length             const t1   new Date   getMilliseconds         var min    1  max    9        var result       var numLength   length       if  numLength    0                 for  var i   1  i  lt  numLength  i                         min   min toString      0              max   max toString      9                          else                min   0          max   0          return                 for  var i   min  i  lt   max  i                         Empty Loop                const t2   new Date   getMilliseconds          console log t2         result     max - min  t1  t2        console log result         return result

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If you need variable between 0 and max you can use   Math floor Math random      max

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Use this function to get random numbers between given range  function rnd min max       return Math floor Math random    max-min 1  min

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Example function ourRandomRange ourMin  ourMax        return Math floor Math random      ourMax - ourMin   1     ourMin     ourRandomRange 1  9       Only change code below this line  function randomRange myMin  myMax        var a   Math floor Math random      myMax - myMin   1     myMin      return a     Change this line       Change these values to test your function var myRandom   randomRange 5  15

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Math random   Returns an integer random number between min  included  and max  included   function randomInteger min  max      return Math floor Math random      max - min   1     min     Or any random number between min  included  and max  not included   function randomNumber min  max      return Math random      max - min    min     Useful examples  integers      0 - gt  10 Math floor Math random     11       1 - gt  10 Math floor Math random     10    1      5 - gt  20 Math floor Math random     16    5      -10 - gt   -2  Math floor Math random     9  - 10      And always nice to be reminded  Mozilla    Math random   does not provide cryptographically secure random numbers  Do not use them for anything related to security  Use the Web Crypto API instead  and more precisely the window crypto getRandomValues   method

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There are some examples on the Mozilla Developer Network page          Returns a random number between min  inclusive  and max  exclusive      function getRandomArbitrary min  max        return Math random      max - min    min            Returns a random integer between min  inclusive  and max  inclusive      The value is no lower than min  or the next integer greater than min    if min isn t an integer  and no greater than max  or the next integer    lower than max if max isn t an integer      Using Math round   will give you a non-uniform distribution      function getRandomInt min  max        min   Math ceil min       max   Math floor max       return Math floor Math random      max - min   1     min        Here s the logic behind it  It s a simple rule of three   Math random   returns a Number between 0  inclusive  and 1  exclusive   So we have an interval like this    0                                      1    Now  we d like a number between min  inclusive  and max  exclusive     0                                      1   min                                    max    We can use the Math random to get the correspondent in the  min  max  interval  But  first we should factor a little bit the problem by subtracting min from the second interval    0                                      1   min - min                              max - min    This gives    0                                      1   0                                      max - min    We may now apply Math random and then calculate the correspondent  Let s choose a random number                   Math random                          0                                      1   0                                      max - min                                            x  what we need    So  in order to find x  we would do   x   Math random      max - min     Don t forget to add min back  so that we get a number in the  min  max  interval   x   Math random      max - min    min    That was the first function from MDN  The second one  returns an integer between min and max  both inclusive   Now for getting integers  you could use round  ceil or floor   You could use Math round Math random      max - min     min  this however gives a non-even distribution  Both  min and max only have approximately half the chance to roll   min   min 0 5   min 1   min 1 5          max-0 5    max  -------  ----------------  -----     -----  ------      Math round      min          min 1                          max   With max excluded from the interval  it has an even less chance to roll than min   With Math floor Math random      max - min  1     min you have a perfectly even distribution   min     min 1    min 2     max-1    max     max 1  is excluded from interval                                                   -------  -------  ---       -------  -------      Math floor      min     min 1               max-1    max   You can t use ceil   and -1 in that equation because max now had a slightly less chance to roll  but you can roll the  unwanted  min-1 result too

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This can handle generating upto 20 digit UNIQUE random number  JS  var generatedNumbers        function generateRandomNumber precision       precision -- gt  number precision in integer      if  precision  lt   20            var randomNum   Math round Math random   toFixed precision    Math pow 10  precision            if  generatedNumbers indexOf randomNum   gt  -1                if  generatedNumbers length    Math pow 10  precision                   return  Generated all values with this precision                   return generateRandomNumber precision             else               generatedNumbers push randomNum               return randomNum                  else        return  Number Precision shoould not exceed 20     generateRandomNumber 1       JsFiddle

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When the two params are dec number  This implemtation will solved function randomRange myMin  myMax      return Math floor      Math random      Math ceil myMax  - Math floor myMin    1    myMin

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To get a random number say between 1 and 6  first do       0 5    Math random       6 - 1    1     This multiplies a random number by 6 and then adds 0 5 to it  Next round the number to a positive integer by doing       Math round 0 5    Math random       6 - 1    1     This round the number to the nearest whole number   Or to make it more understandable do this       var value   0 5    Math random       6 - 1    1       var roll   Math round value       return roll    In general the code for doing this using variables is       var value    Min - 0 5     Math random       Max - Min    1       var roll   Math round value       return roll    The reason for taking away 0 5 from the minimum value is because using the minimum value alone would allow you to get an integer that was one more than your maximum value  By taking away 0 5 from the minimum value you are essentially preventing the maximum value from being rounded up   Hope that helps

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I made this function which takes into account options like min  max  exclude  a list of ints to exclude   and seed  in case you want a seeded random generator    get random int   function args           let def args                 min  0          max  1          exclude  false          seed  Math random            args   Object assign def args  args       let num   Math floor args seed      args max - args min   1    args min       if args exclude                let diff   args max - args min         let n   num          for let i 0  i lt diff 2  i                          if args exclude includes n                                 if n   1  lt   args max                                        n    1                                    else                                       n   args min                                              else                               num   n                 break                                    return num     It can be used like   let n   get random int                 min  0          max  some list length - 1          exclude   3  6  5           seed  my seed function           Or more simply   let n   get random int                 min  0          max  some list length - 1           Then you can do   let item   some list n    Gist  https   gist github com madprops 757deb000bdec25776d5036dae58ee6e

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I know this question is already answered but my answer could help someone   I found this simple method on W3Schools   Math floor  Math random     max    min     Hope this would help someone

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The other answers don t account for the perfectly reasonable parameters of 0 and 1  Instead you should use the round instead of ceil or floor   function randomNumber minimum  maximum       return Math round  Math random      maximum - minimum    minimum      console log randomNumber 0 1       0 1 1 0 1 0 console log randomNumber 5 6       5 6 6 5 5 6 console log randomNumber 3 -1      1 3 1 -1 -1 -1

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var randomnumber   Math floor Math random      maximum - minimum   1     minimum

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function randomRange min  max      return    Math random      max - min   1     min     Alternative if you are using Underscore js you can use    random min  max

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Random whole number between lowest and highest   function randomRange l h     var range    h-l     var random   Math floor Math random   range     if  random     0  random  1     return l random      Not the most elegant solution   but something quick

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Using following code you can generate array of random numbers  without repeating  in a given range   function genRandomNumber how many number min max                    parameters                how many number   how many numbers you want to generate  For example it is 5                 min inclusive    minimum low value of a range  it must be any positive integer but less than max  i e 4                max inclusive    maximun value of a range  it must be any positive integer  i e 50                return type  array              var random number                   for  var i   0  i  lt  how many number  i                      var gen num   parseInt  Math random      max-min 1     min                   do                       var is exist   random number indexOf gen num                       if  is exist  gt   0                            gen num   parseInt  Math random      max-min 1     min                                             else                           random number push gen num                           is exist   -2                                                          while  is exist  gt  -1                             document getElementById  box   innerHTML   random number

[javascript] Generating random whole numbers in JavaScript in a specific range?

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