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Split function input and output order

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# 1  
Old 09-02-2010
Split function input and output order
Dear Forum

I'm Trying to use split function to split a string, but the output is not as the same order as of the string, please see simple example

Code:
echo " " | nawk -v var="First;Second;Third;Fourth" '
BEGIN {split(var, arr,";") for(i in arr){print arr[i] }}'

The output is

Code:
Second
Third
Fourth
First

How can I make the output as same order as the input string ?

Needed Output
First
Second
Third
Fourth
# 2  
Old 09-02-2010
Code:
echo " " | nawk -v var="First;Second;Third;Fourth" '
BEGIN {n=split(var, arr,";") for(i=1;i<=n;i++){print arr[i] }}'

# 3  
Old 09-02-2010
Thanks a lot franklin, so this is an issue of split function ? is there any rule that can tell how "split" function do its work ?
# 4  
Old 09-02-2010
Quote:
Originally Posted by yahyaaa
Thanks a lot franklin, so this is an issue of split function ? is there any rule that can tell how "split" function do its work ?
From an excerption of the gawk manual:
Quote:
split(string, array [, fieldsep])
This function divides string into pieces separated by fieldsep and stores the pieces in array. The first piece is stored in array[1], the second piece in array[2], and so forth. The string value of the third argument, fieldsep, is a regexp describing where to split string (much as FS can be a regexp describing where to split input records). If fieldsep is omitted, the value of FS is used. split returns the number of elements created.
# 5  
Old 09-02-2010
Adding to that...

The "problem" is not with split. It's with arrays:

(also from the man page...)
Code:

 There is a form of the for statement that loops over each index    of  anarray.

        for ( var in array ) statement

sets var to each index of array and executes statement.    The order that var transverses the indices of array is not defined.

# 6  
Old 09-02-2010
To get the same order with gawk, you can use the undocument variable WHINY_USERS:
Code:
WHINY_USERS=1 gawk -v var="First;Second;Third;Fourth" '
BEGIN {split(var, arr,";") for(i in arr){print arr[i] }}'

# 7  
Old 09-02-2010
Quote:
Originally Posted by Franklin52
To get the same order with gawk, you can use the undocument variable WHINY_USERS:
Code:
WHINY_USERS=1 gawk -v var="First;Second;Third;Fourth" '
BEGIN {split(var, arr,";") for(i in arr){print arr[i] }}'

Smilie

Makes me laugh every time Smilie
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