JavaScript Number Split into individual digits

Question

I am trying to solve a math problem where I take a number e g  45  or 111 and then split the number into separate digits e g  4 5 or 1 1 1  I will then save each number to a var to run a method on  Does anyone know how to split a number into individual digitals  For example I have a loop that runs on an array   for  var i   0  i  lt  range length  i        var n   range i      For each number  I would like to split its digits and add them together

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var num   111   separateDigits   num toString   split      i  l   separateDigits length   for  i   0  i  lt  l    i     someObject someMethod   separateDigits i

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Iterate through each number with for   of statement  By adding a   sign before a String  it will be converted into a number   x000D   x000D  const num   143    digits        for  const digit of    num        digits push  digit    console log digits   x000D   x000D   x000D   Inspired by  iampopov You can write it with spread syntax   x000D   x000D  const num   143  const digits          num    map Number   console log digits   x000D   x000D   x000D

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You can try this     var num   99     num num toString   split     map value  gt parseInt value 10      output  9 9    Hope this helped

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I am posting this answer to introduce the use of unshift which is a modern solution  With push  you add to the end of an array while unshift adds to the beginning  This makes the mathematical approach more powerful as you won t need to reverse anymore   x000D   x000D  let num   278  let digits       while  num  gt  0        digits unshift num   10       num   parseInt num   10     console log digits   x000D   x000D   x000D

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To just split an integer into its individual digits in the same order  Regular Expression is what I used and prefer since it prevents the chance of loosing the identity of the numbers even after they have been converted into string   The following line of code convert the integer into a string  uses regex to match any individual digit inside the string and return an array of those  after which that array is mapped to be converted back to numbers   const digitize   n   gt  String n  match   d g  map Number

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With ES6  you could use Array from with a stringed number as iterables and Number as mapping function    x000D   x000D  const getDigits   n   gt  Array from n toString    Number   x000D   x000D  console log getDigits 12345    x000D   x000D   x000D

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I will provide a variation on an answer already given so you can see a different approach that preserves the numeric type all along   var number   12354987      output        while  number        output push number   10       number   Math floor number 10      console log output reverse   join           1 2 3 5 4 9 8 7   I ve used a technique such as the above to good effect when converting a number to Roman numerals  which is one of my favorite ways to begin to learn a programming language I m not familiar with   For instance here is how I devised a way to convert numbers to Roman numerals with Tcl slightly after the turn of the century  http   code activestate com recipes 68379-conversion-to-roman-numerals   The comparable lines in my Tcl script being     while   arabic        set digit  expr   arabic 10       set arabic  expr   arabic 10

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javascript has a function for it and you can use it easily   console log new Intl NumberFormat   format number      for example    console log new Intl NumberFormat   format 2334325443534       gt  2 334 325 443 534

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You can also do it in the  mathematical  way without treating the number as a string    x000D   x000D  var num   278  x000D  var digits       x000D  while  num  gt  0    x000D      digits push num   10   x000D      num   parseInt num   10   x000D    x000D  digits reverse    x000D  console log digits   x000D   x000D   x000D    One upside I can see is that you won t have to run parseInt   on every digit  you re dealing with the actual digits as numeric values

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I used this simple way of doing it   To split digits  var N   69  var arr   N toString   split     map Number     outputs  6 9  console log  arr       To add them together  console log arr reduce   a b    gt  a b        15

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This also works    x000D   x000D  var number   12354987  x000D  console log String number  split     map Number    x000D   x000D   x000D

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123456789  split     map  x   gt   x   reduce   a b    gt  a b       45  true  or without map        123456789  split     reduce   a b    gt    a    b        45  true

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x000D   x000D     Split positive integer n  lt  1e21 into digits  x000D  function digits n    x000D    return Array from String n   Number   x000D    x000D   x000D     Example  x000D  console log digits 1234        1  2  3  4  x000D   x000D   x000D

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Without converting to string   function toDigits number        var left      var results            while  true            left   number   10          results unshift left           number    number - left    10          if  number     0                break                       return results

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Separate each 2 parametr    function separator str sep        var output           for  var i   str length  i  gt  0  i- 2            var ii   i-1          if output                output   str charAt ii-1  str charAt ii  sep output            else               output   str charAt ii-1  str charAt ii                                   return output    console log separator  123456           Will return 12 34 56

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I might be wrong  but a solution picking up bits and pieces  Perhaps  as I still learning  is that the functions does many things in the same one  Do not hesitate to correct me  please   const totalSum    num    gt      num        map Number  reduce  a  b    gt  a   b     So we take the parameter and convert it to and arr  adding empty spaces  We do such operation in every single element and push it into a new array with the map method  Once splited  we use reduce to sum all the elements and get the total   As I said  don t hesitate to correct me or improve the function if you see something that I don t    Almost forgot  just in case   const totalSum    num    gt    num     0    num  lt  0     I need a positive number        num        map Number  reduce  a  b    gt  a   b      If negatives numbers or just plain zero go down as parameters  Happy coding to us all

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var number   12354987      output           sNumber   number toString     for  var i   0  len   sNumber length  i  lt  len  i    1        output push  sNumber charAt i       console log output       Outputs         1  2  3  5  4  9  8  7         UPDATE  Calculating a sum  for  var i   0  sum   0  i  lt  output length  sum    output i      console log sum          Outputs  39

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x000D   x000D  var num   123456  x000D  var digits   num toString   split      x000D  var realDigits   digits map Number  x000D  console log realDigits   x000D   x000D   x000D

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This is my short solution   with sum of number      function sum  num        let sNumber   num          toString            split              reduce  el1  el2    gt                return Number el1    Number el2             0          return sNumber             console log sum 123      console log sum 456

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function iterateNumber N  f        let n   N      var length   Math log n    Math LOG10E   1   0      for  let i   0  i  lt  length  i              const pow   Math pow 10  length - i - 1          let c    n -  n   pow     pow         f c  i          n    pow

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This is the shortest I ve found  though it does return the digits as strings   let num   12345       num         1    2    3    4    5     Or use this to get back integers       num     map n  gt  n     1  2  3  4  5

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A fun introduction to recursion  This answer takes a Number and returns an array of Number digits  It does not convert the number to a string as an intermediate step   Given n   1234    n   10 will return first  right-moist  digit  4 n   10 will return 123 with some remainder Using Math floor we can chop the remainder off Repeating these steps  we can form the entire result   Now we just have to build the recursion condition    If the number is already a single digit  n  lt  10   return an array singleton of the digit otherwise  inductive  the number is 10 or greater  recur and prepend to the first digit    x000D   x000D  const digits    n   0    gt  x000D    n  lt  10 x000D          n   x000D              digits  Math floor  n   10    n   10   x000D   x000D  console log  digits                 0   x000D  console log  digits  1              1   x000D  console log  digits  12             1  2   x000D  console log  digits  123            1  2  3   x000D  console log  digits  11234          1  2  3  4   x000D   x000D  console log  digits  123456789012   x000D       1  2  3  4  5  6  7  8  9  0  1  2   x000D   x000D   x000D

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A functional approach in order to get digits from a number would be to get a string from your number  split it into an array  of characters  and map each element back into a number   For example   var number   123456   var array   number toString    split      map function item  index       return parseInt item        console log array      returns  1  2  3  4  5  6    If you also need to sum all digits  you can append the reduce   method to the previous code   var num   123456   var array   num toString    split      map function item  index       return parseInt item       reduce function previousValue  currentValue  index  array      return previousValue   currentValue     0    console log array      returns 21     As an alternative  with ECMAScript 2015  6th Edition   you can use arrow functions   var number   123456  var array   number toString   split     map  item  index    gt  parseInt item    console log array      returns  1  2  3  4  5  6    If you need to sum all digits  you can append the reduce   method to the previous code   var num   123456   var result   num toString    split      map  item  index    gt  parseInt item    reduce  previousValue  currentValue    gt  previousValue   currentValue  0    console log result      returns 21

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You can do it in single line  seperate each digits than add them together    var may   12987  var sep       may  split     map n  gt  n  reduce  a b   gt a b

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Shadow Wizard   extended version by Orien  var num Number   1523  var digits Array       var cnt int   0  while  num  gt  0        var mod int   num   10      digits push mod   Math pow 10  cnt        num   Math floor num   10       cnt      digits reverse    trace digits     output 1000 500 20 3

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Using String      and map  x000D   x000D  const num   7890   const digits       String num   map Number    console log digits  x000D   x000D   x000D   Alternatively  using     and reduce to get digits and their sum   x000D   x000D  const sumOfDigits   num   gt         num  reduce  acc  dig    gt  acc    dig  0    console log  Sum of digits     sumOfDigits 7890    x000D   x000D   x000D

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And the easiest      num string split     map Number   Try below    x000D   x000D  console log     123  split     map Number   x000D   x000D   x000D

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You can work on strings instead of numbers to achieve this  You can do it like this    111       split       This will return an array of strings   1   1   1   on which you can iterate upon and call parseInt method   parseInt  1       1   If you want the sum of individual digits  you can use the reduce function  implemented from Javascript 1 8  like this   111       split     reduce function previousValue  currentValue       return parseInt previousValue 10    parseInt currentValue 10

[javascript] JavaScript Number Split into individual digits

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