Re: Listing the names contained in a record
Re: Listing the names contained in a record
- Subject: Re: Listing the names contained in a record
- From: Gakuji Ohtori <email@hidden>
- Date: Thu, 31 Oct 2002 03:26:26 +0900
On 2002.10.30, at 05:37 PM, John Delacour wrote:
At 1:28 am -0600 30/10/02, Jeffrey Mattox wrote:
Is there a way to get a list of the names of the name/value pairs in
a record?
If you are responsible for creating the record, then instead of
creating a record, create a list and use the odd-numbered items for
the keys and the even-numbered for the values. Here's an example I
posted a couple of weeks ago:
set {key_, value_} to {"key1", false}
set array_ to {"key1", "value1", "key2", "value2"}
repeat with i from 1 to count array_
if i mod 2 is 1 then
if item i of array_ is key_ then
set value_ to item (i + 1) of array_
exit repeat
end if
end if
end repeat
if value_ is not false then return value_
I would use a list of records instead of a flat (1 dimentional) list:
set theRecList to {{k:"a", v:1}, {k:"b", v:2}, {k:"c", v:3}}
set theKeyList to {}
repeat with eachItem in theRecList
set end of theKeyList to k of contents of eachItem
end repeat
return theKeyList
--> {"a", "b", "c"}
By the way, "every item" seems to extract all values from a record:
set r to {a:1, b:2, c:3}
every item of r
--> {1, 2, 3}
I couldn't find the way to extract the list of labels ({a, b, c} in the
example above) from a record. Does anyone know?
Gaji
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