CODEWITHSUNDEEP
awk
a113nw
a113nw

Reputation: 1412

how can i iterate over items in two different arrays in awk?

I want to do something like:

for (x in {a,b}) {
  ...
}

Is there a way to do this in awk?

Upvotes: 0

Views: 164

Answers (1)

Ed Morton
Ed Morton

Reputation: 203254

Two options:

1)

for (x in a)
   u[x]

for (x in b)
   u[x]

for (x in u)
   print "Union Index:",x

2)

for (x in a)
   print "Union Index:",x

for (x in b)
   if (!(x in a))
      print "Union Index:",x

and if you want something you can use succinctly in a for loop:

$ cat tst.awk
function indices(a,b,u, x,c)
{
   for (x in a) {
      u[++c] = x
   }

   for (x in b) {
      if (!(x in a)) {
         u[++c] = x
      }
   }

   return c
}

BEGIN {
   a[3]="foo"
   a[9]=3

   b[5]=7
   b[15]=45

   for (i=1; i<=indices(a,b,u); i++) {
      print u[i]
   }
}
$ awk -f tst.awk
9
3
5
15

Upvotes: 3

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