less than 10 add 0 to number

Question

How can I modify this code to add a 0 before any digits lower than 10      detect   html  toGeo apX  screenX     latT        toGeo apY  screenY    lonT      function toGeo d  max       var c           var r   d max   180     var deg   Math floor r      c    deg              r    r - deg    60     var min   Math floor r      c    min             r    r - min    60     var sec   Math floor r      c    sec            return c      So the outpout would change from   4   7  34 W  168   1  23 N   to  04   07  34 W  168   01  23 N   Thanks for your time

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You can always do    0    deg  slice -2    If you use it very often  you may extend the object Number  Number prototype pad   function n        if  n  undefined          n   2       return  new Array n  join  0     this  slice -n      deg pad 4      0045    where you can set any pad size or leave the default 2

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A single regular expression replace should do it   var stringWithSmallIntegers    4   7  34 W  168   1  23 N    var paddedString   stringWithSmallIntegers replace        d  g      function pad digits            return digits length     1    0    digits   digits           alert paddedString     shows the expected output

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if myNumber toString   length  lt  2     myNumber   0  myNumber    or   return  myNumber toString   length  lt  2     0  myNumber   myNumber

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Here is Genaric function for add any number of leading zeros for making any size of numeric string    function add zero your number  length        var num        your number      while  num length  lt  length            num    0    num            return num

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You can write a generic function to do this     var numberFormat   function number  width        return new Array  width   1 -  number       length  join  0     number      jsFiddle   That way  it s not a problem to deal with any arbitrarily width

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detect   html  toGeo apX  screenX     latT        toGeo apY  screenY    lonT      function toGeo d  max       var c           var r   d max   180     var deg   Math floor r      if deg  lt  10  deg    0    deg     c    deg              r    r - deg    60     var min   Math floor r      if min  lt  10  min    0    min     c    min             r    r - min    60     var sec   Math floor r      if sec  lt  10  sec    0    sec     c    sec            return c

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Make a function that you can reuse   function minTwoDigits n      return  n  lt  10    0          n      Then use it in each part of the coordinates   c    minTwoDigits deg             and so on

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Hope  this help   Number prototype zeroFill  function  n        var isNegative   this  lt  0      var number   isNegative   -1   this   this      for  var i   number toString   length  i  lt  n  i              number    0    number            return  isNegative    -          number

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You can always do     0    deg  slice -2    See slice        You can also use negative numbers to select from the end of an array   Hence    0    11  slice -2      11    0    4  slice -2       04    For ease of access  you could of course extract it to a function  or even extend Number with it   Number prototype pad   function n        return new Array n  join  0   slice  n    2    -1    this      Which will allow you to write   c    deg pad                04       The above function pad accepts an argument specifying the length of the desired string  If no such argument is used  it defaults to 2  You could write   deg pad 4      0045    Note the obvious drawback that the value of n cannot be higher than 11  as the string of 0 s is currently just 10 characters long  This could of course be given a technical solution  but I did not want to introduce complexity in such a simple function   Should you elect to  see alex s answer for an excellent approach to that    Note also that you would not be able to write 2 pad    It only works with variables  But then  if it s not a variable  you ll always know beforehand how many digits the number consists of

User · Answer

I was bored and playing around JSPerf trying to beat the currently selected answer prepending a zero no matter what and using slice -2   It s a clever approach but the performance gets a lot worse as the string gets longer   For numbers zero to ten  one and two character strings  I was able to beat by about ten percent  and the fastest approach was much better when dealing with longer strings by using charAt so it doesn t have to traverse the whole string   This follow is not quit as simple as slice -2  but is 86 -89  faster when used across mostly 3 digit numbers  3 character strings    var prepended     1     string length  amp  amp  string charAt  0        0       0    string   string

[javascript] less than 10 add 0 to number

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