Refactor day 2 awk

2019/02/day2.awk

@@ -1,15 +1,19 @@
-{
-    len = split($1, arr, ",");
+# There are no scopes, so we just write to `arr` here and use it later.
+# Returning the array does not seem to be legal either. Only scalars allowed.
+function prepareInput(raw) {
+    len = split(raw, arr, ",");
     for (i=0; i<=len; i++) {
-        arr[i-1] = arr[i];
+        arr[i-1] = int(arr[i]);
     }
-    arr[1] = 12;
-    arr[2] = 2;
+    return len
+}
+
+function process(arr, len) {
     for (i=0; i<len; i+=4) {
-        cmd = int(arr[i]);
-        e1 = int(arr[i+1]);
-        e2 = int(arr[i+2]);
-        target = int(arr[i+3]);
+        cmd = arr[i];
+        e1 = arr[i+1];
+        e2 = arr[i+2];
+        target = arr[i+3];
         if (cmd == 1)
             arr[target] = arr[e1] + arr[e2];
         else if (cmd == 2)
@@ -19,5 +23,12 @@
         else
             print "Error, invalid command";
     }
+}
+
+{
+    len = prepareInput($1);
+    arr[1] = 12;
+    arr[2] = 2;
+    process(arr, len)
     print arr[0]
 }