From Newsgroup: comp.lang.awk


@include “github.com/digics/UID10/uid.lib”

LIST = hid::get( “LIST” )

An array (A) in AWK can represent a list of unique items with an undefined order.
To introduce the concept of an array with a defined sequence of its indexes (items),
we need to specify this sequence in a subarray A[LIST] as a simple list.

# items of A: first, next and last:

A[ “LIST” ][ “” ] = “first”
[ “first” ] = “next”
[ “next” ] = “last”
[ “last” [ = “”
[ “first” ]...
[ “next” ]...
[ “last” ]...

Thus, instead of a for-in loop for array A, we use:

i = “”
while ( “” != i = A[ LIST][ i ] )

# process A[ i ]

or

for ( i = “”; “” != i = A[ LIST ][ i ]; )

# process A[ i ]

At the same time, we can still work with the main array in a for-in loop — with one caveat:

for ( i in A )
if ( i in HID )
continue # this is hid (LIST)
else
# process A[ i ]


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