How to convert a string of numbers to an array of numbers

Question

I have below string -  var a    1 2 3 4     when I do -  var b   a split         I get b as   1    2    3    4    can I do something to get b as  1  2  3  4

User · Answer

As a variant you can use combiantion   map and   ary methods from the lodash library  Whole transformation will be a more compact  Here is example from the official documentation     map   6    8    10      ary parseInt  1          6  8  10

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Matt Zeunert s version with use arraw function  ES6   const nums   a split      map x   gt  parseInt x  10

User · Answer

You can use JSON parse  adding brakets to format Array  x000D   x000D  const a    1 2 3 4   const myArray   JSON parse     a     console log myArray  console info  pos 2       myArray 2   x000D   x000D   x000D

User · Answer

Array from   for details go to MDN  var a    1 2 3 4   var b   Array from a split      Number     b is an array of numbers

User · Answer

string will try to change the string to a number  Then use Array map function to change every element    1 2 3 4  split      map function el   return  el

User · Answer

My 2 cents for golfers   b  1 2 3 4  split    map x  gt  x    backquote is string litteral so we can omit the parenthesis  because of the nature of split function  but it is equivalent to split       The string is now an array  we just have to map each value with a function returning the integer of the string so x  gt  x  which is even shorter than the Number function  5 chars instead of 6   is equivalent to    function x  return parseInt x 10     version from techfoobar  x   gt  return parseInt x              lambda are shorter and parseInt default is 10  x   gt  return  x                      diff  with parseInt in SO but   is better in this case x  gt  x                                no multiple args  just 1 function call   I hope it is a bit more clear

User · Answer

There s no need to use lambdas and or give radix parameter to parseInt  just use parseFloat or Number instead   Reasons    It s working   var src    1 2 5 4 3   var ids   src split      map parseFloat       1  2  5  4  3   var obj    1       3       4       7        var keys  Object keys obj        1    3    4    7   var ids   keys map parseFloat       1  3  4  7   var arr     1   5   7   11   var ints  arr map parseFloat       1  5  7  11  ints 1       5     false ints 1      5      true ints 2       7     false ints 2      7      true  It s shorter  It s a tiny bit quickier and takes advantage of cache  when parseInt-approach - doesn t        execution time measure function      keep it simple  yeah   gt  var f    function  arr  c  n  m          var i t m s n          for i 0 i   lt c  t arr map m         return n  -s      bind null   2 4 6 8 0 9 7 5 3 1  split       1000000  Date now     gt  f Number     first launch  just warming-up cache  gt  3971    nice      gt  f Number   gt  3964    still the same   gt  f function e  return e    gt  5132    yup  just little bit slower   gt  f function e  return e    gt  5112    second run    and ok    gt  f parseFloat   gt  3727    little bit quicker than  map Number    gt  f parseFloat   gt  3737    all ok   gt  f function e  return parseInt e 10     gt  21852    awww  how adorable      gt  f function e  return parseInt e     gt  22928    maybe  without  10     nope    gt  f function e  return parseInt e     gt  22769    second run    and nothing changes    gt  f Number   gt  3873    and again  gt  f parseFloat   gt  3583    and again  gt  f function e  return e    gt  4967    and again   gt  f function e  return parseInt e 10     gt  21649    dammit  parseInt    gt   lt     Notice  In Firefox parseInt works about 4 times faster  but still slower than others  In total   e  lt  Number  lt  parseFloat  lt  parseInt

User · Answer

This is very simple Such as     quot 1 quot    quot 2 quot    quot 3 quot    quot 4 quot   map i  gt Number i    you can run the demo   x000D   x000D  let result     1    2    3    4   map i  gt Number i    console log result   x000D   x000D   x000D

User · Answer

You can use Array map to convert each element into a number   var a    1 2 3 4    var b   a split      map function item        return parseInt item  10         Check the Docs    Or more elegantly as pointed out by User  thg435  var b   a split      map Number     Where Number   would do the rest check here    Note  For older browsers that don t support map  you can add an implementation yourself like   Array prototype map   Array prototype map    function  x        for var o     i 0  i lt this length  i               o i     x this i               return o

User · Answer

Since all the answers allow NaN to be included  I thought I d add that if you want to quickly cast an array of mixed values to numbers you can do   var a    1 2 3 4 foo bar    var b   a split        var result   b map    gt   0     Floors the number  32-bit signed integer  so this wont work if you need all 64 bits      or b map    gt    0  if you know your array is just numbers but may include NaN

User · Answer

A more shorter solution  map and pass the arguments to Number    x000D   x000D  var a    1 2 3 4   x000D  var b   a split       x000D  console log b   x000D  var c   b map Number   x000D  console log c   x000D   x000D   x000D

User · Answer

The underscore js way -     var a    1 2 3 4     b   a split          remove falsy empty values from array after split b     compact b     then Convert array of string values into Integer b     map b  Number    console log  Log String to Int conversion  b     b

User · Answer

Map it to integers   a split      map function i       return parseInt i  10        map looks at every array item  passes it to the function provided and returns an array with the return values of that function  map isn t available in old browsers  but most libraries like jQuery or underscore include a cross-browser version   Or  if you prefer loops   var res   a split       for  var i 0  i lt res length  i          res i    parseInt res i   10

User · Answer

You can transform array of strings to array of numbers in one line  const arrayOfNumbers   arrayOfStrings map e   gt   e

User · Answer

One liner  Array from a split       Number

[javascript] How to convert a string of numbers to an array of numbers?

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