• Gordon (18/18) Feb 22 2014 Hello,
• Tobias Pankrath (4/9) Feb 22 2014 std.array.assocArray.
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (10/11) Feb 22 2014 If I am allowed to misunderstand :) it as a *single* hash from all of

"Gordon" <me home.com> writes:

Hello,

Is there a way to quickly build a hash from the values of an 
array?

A one-statement equivalent of:
   T[] array_values ;
   int[T] hash_values;

   hash_values = map!(XXXX) (array_values) ;

Instead of:
   for (v; array_values) {
      hash_values[v] = 1;
   }


in Perl, that would be:

   %hash = map { $_ => 1 }  array;

---

Or, put differently, is there a way to convert values in an array 
to keys of hash in one statement ?

Thanks!
  -gordon

"Tobias Pankrath" <tobias pankrath.net> writes:

 ---

 Or, put differently, is there a way to convert values in an 
 array to keys of hash in one statement ?

 Thanks!
  -gordon

std.array.assocArray.

--
T[] keys;
auto aa = zip(keys, repeat(true)).assocArray;

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 02/22/2014 11:26 AM, Gordon wrote:

 Is there a way to quickly build a hash from the values of an array?

If I am allowed to misunderstand :) it as a *single* hash from all of 
the values, then you can use D's internal hash algorithm for arrays:

import std.stdio;

void main()
{
     auto arr = [ 1, 2, 3 ];
     writeln(typeid(arr).getHash(&arr));
}

Ali