On Friday, 2 December 2022 at 18:26:36 UTC, Steven Schveighoffer wrote:

['A' : ['B': 0]]

(['A' : ['B': 0]])

This looks like the nested objects I use in JSON and doesn't need parentheses because it's built with JSON. For example, without the parentheses, the first one will not compile, but will compile when the individual objects are created:

void main()
{
  alias letter = int[char];/*
  letter[string] letters = [
    "Upper" : ['A': 65],
    "Lower" : ['a': 97]
  ]; //* not compile */

  letter[string] letters = ([
    "Upper" : ['A': 65],
    "Lower" : ['a': 97]
  ]); // okay

  letter[]  up = [['A': 65], ['B': 66], ['C': 67]];
  letter[] low = [['a': 97], ['b': 98], ['c': 99]];

  letter[string] lets = [
    "Upper" : up[0],
    "Lower" : low[0]
  ]; // okay

  assert(lets == letters);
}

SDB@79

On Friday, 2 December 2022 at 19:36:10 UTC, Salih Dincer wrote:

Here's what I'm talking about:

import std.json;
import std.stdio;

void main()
{
  alias nd = JSONValue;
  nd root;
  string[] A, I;

  A = ["a", "â", "A", "Â"];
  I = ["ı", "î", "I", "Î"];

  nd[string] let = [
    "Lower" : nd([ "a letter" : nd( A[0..2] ),
                   "ı letter" : nd( I[0..2] )
    ]),
    "Upper" : nd([ "A letter" : nd( A[2..$] ),
                   "I letter" : nd( I[2..$] )
    ])
  ];

  root.object = ["Turkish" : nd( let )];
  root.toJSON(true).writeln;
} /*
{
    "Turkish": {
        "Lower": {
            "a letter": [
                "a",
                "â"
            ],
            "ı letter": [
                "ı",
                "î"
            ]
        },
        "Upper": {
            "A letter": [
                "A",
                "Â"
            ],
            "I letter": [
                "I",
                "Î"
            ]
        }
    }
}
*/

So you need to init nested AA at different times. If you want the compiler to do this in one line, we have to use parentheses.

SDB@79