convert string into array of integers

Question

I want to convert the following string  14 2  into an array of two integers  How can I do it

User · Accepted Answer

You can  split   to get an array of strings  then loop through to convert them to numbers  like this   var myArray    14 2  split       for var i 0  i lt myArray length  i      myArray i     myArray i        use myArray  it s an array of numbers   The  myArray i  is just  a quick way to do the number conversion  if you re sure they re integers you can just do   for var i 0  i lt myArray length  i      myArray i    parseInt myArray i   10

User · Answer

If the numbers can be separated by more than one space  it is safest to split the string on one or more consecutive whitespace characters  which includes tabs and regular spaces   With a regular expression  this would be  s   You can then map each element using the Number function to convert it  Note that parseInt will not work  i e  arr map parseInt   because map passes three arguments to the mapping function  the element  the index  and the original array  parseInt accepts the base or radix as the second parameter  so it will end up taking the index as the base  often resulting in many NaNs in the result  However  Number ignores any arguments other than the first  so it works directly  const str    1 t t2   3 4   const result   str split   s    map Number      1 2 3 4   You could also use an anonymous function for the mapping callback with the unary plus operator to convert each element to a number  const str    1 t t2   3 4   const result   str split   s    map x   gt   x      1 2 3 4   With an anonymous function for the callback  you can decide what parameters to use  so parseInt can also work  const str    1 t t2   3 4   const result   str split   s    map x   gt  parseInt x       1 2 3 4

User · Answer

Just for fun I thought I d throw a forEach f    solution in too   var a      14 2  split      forEach function e  a push parseInt e 10          a    14 2

User · Answer

First split the string on spaces   var result    14 2  split         Then convert the result array of strings into integers   for  var i in result        result i    parseInt result i   10

User · Answer

let idsArray   ids split      map  x    gt  parseInt x

User · Answer

Better one line solution    var answerInt       var answerString    1 2 3 4   answerString split      forEach function  item       answerInt push parseInt item

User · Answer

us the split function   var splitresult    14 2  split

User · Answer

An alternative to Tushar Gupta answer would be     14 2  split      map x  gt  x        14  2     In code golf you save 1 character  Here the     is  unary plus  operator  works like parseInt

User · Answer

var result    14 2  split      map function x  return parseInt x

User · Answer

A quick one for modern browsers    14 2  split      map Number        14  2

User · Answer

The point against parseInt-approach   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

SO   older thread  I know  but     EDIT   RoccoMusolino had a nice catch  here s an alternative   TL DR    const intArray         5 6 7 69 foo 0  split      filter i   gt    d g test i         WRONG   5 6 note this foo  split      map Number  filter Boolean       5  6   There is a subtle flaw in the more elegant solutions listed here  specifically  amillara and  Marcus  otherwise beautiful answers   The problem occurs when an element of the string array isn t integer-like  perhaps in a case without validation on an input  For a contrived example     The problem     var effedIntArray    5 6 7 69 foo  split      map Number       5  6  7  69  NaN    Since you obviously want a PURE int array  that s a problem  Honestly  I didn t catch this until I copy-pasted SO code into my script         The  slightly-less-baller  fix     var intArray    5 6 7 69 foo  split      map Number  filter Boolean       5  6  7  69    So  now even when you have crap int string  your output is a pure integer array  The others are really sexy in most cases  but I did want to offer my mostly rambly w actually  It is still a one-liner though  to my credit     Hope it saves someone time

[javascript] convert string into array of integers

Examples related to javascript