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From: Alexis <flexibeast@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Loops (was Re: do { quit; } else { })
Date: Sat, 19 Apr 2025 11:01:57 +1000
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Xref: csiph.com comp.lang.c:392702

bart <bc@freeuk.com> writes:

> * Awk primarily uses a C-style for loop; using 'for in' is an
>   alternative (it's not clear if this is specific to gnu-Awk)

It's POSIX. Quoting awk(1p):

  |       Syntax       |      Name        | Type of Result | Associativity |
  | [...]              |                  |                |               |
  | expr in array      | Array membership | Numeric        | Left          |
  | ( index ) in array | Multi-dimension  | Numeric        | Left          |
  |                    | array membership |                |               |

  [...]

  The delete statement shall remove an individual array element. Thus,
  the following code deletes an entire array:

    for (index in array)
        delete array[index]


Alexis.