Array sort doesn t sort numbers correctly

Question

In Chrome 14  and Firefox 5  haven t tested other browsers   the following code doesn t sort the numbers correctly    lt script gt  a   new Array    a push 10   a push 60   a push 20   a push 30   a push 100     document write a sort     lt  script gt    It returns 10 100 20 30 60  I ve tried different numbers  and it always acts as if the 0s aren t there and sorts the numbers correctly otherwise  Anyone know why

User · Answer

try this   a   new Array    a push 10   a push 60   a push 20   a push 30   a push 100   a sort Test   document write a     function Test a b        return a  gt  b   true   false

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You can use a sort function    var myarray  25  8  7  41  myarray sort  function a b    return b - a          7 8 25 41   Look at http   www javascriptkit com javatutors arraysort shtml

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The default sort for arrays in Javascript is an alphabetical search  If you want a numerical sort  try something like this   var a     1  100  50  2  5   a sort function a b    return a - b

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I ve tried different numbers  and it always acts as if the 0s aren t there and sorts the numbers correctly otherwise  Anyone know why   You re getting a lexicographical sort  e g  convert objects to strings  and sort them in dictionary order   which is the default sort behavior in Javascript  https   developer mozilla org en JavaScript Reference Global Objects Array sort  array sort  compareFunction    Parameters compareFunction Specifies a function that defines the sort order  If omitted  the array is sorted lexicographically  in dictionary order  according to the string conversion of each element   In the ECMAscript specification  the normative reference for the generic Javascript   ECMA-262  3rd ed   section 15 4 4 11  the default sort order is lexicographical  although they don t come out and say it  instead giving the steps for a conceptual sort function that calls the given compare function if necessary  otherwise comparing the arguments when converted to strings  13  If the argument comparefn is undefined  go to step 16  14  Call comparefn with arguments x and y  15  Return Result 14   16  Call ToString x   17  Call ToString y   18  If Result 16   lt  Result 17   return -1  19  If Result 16   gt  Result 17   return 1  20  Return  0

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a sort function a b  return a - b     These can be confusing     check this link out

[javascript] Array.sort() doesn't sort numbers correctly

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