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digitalmars.D.learn - Strange behavior of cast(int[]) json["my int list"].array

reply Enjoys Math <enjoysmath gmail.com> writes:
I had it working in an earlier program.

Now I have:


main.d
------

import std.json;
import std.file;

int main() {
    JSONValue settings;

    settings = parseJSON("settings.txt");
    auto intList = cast(int[]) settings["int list"].array;

    writeln(intList);

    readln();
}


for input:

settings.txt
------------
{
    "int list" : [1,2,3,4,5]
}


printing:

[1,0,2,0,2,0,2,0,3,0,2, ...] (length = 20)


Should I access each member int the array individually?
Nov 15
parent Basile B. <b2.temp gmx.com> writes:
On Wednesday, 15 November 2017 at 19:54:20 UTC, Enjoys Math wrote:
 I had it working in an earlier program.

 Now I have:


 main.d
 ------

 import std.json;
 import std.file;

 int main() {
    JSONValue settings;

    settings = parseJSON("settings.txt");
    auto intList = cast(int[]) settings["int list"].array;

    writeln(intList);

    readln();
 }


 for input:

 settings.txt
 ------------
 {
    "int list" : [1,2,3,4,5]
 }


 printing:

 [1,0,2,0,2,0,2,0,3,0,2, ...] (length = 20)


 Should I access each member int the array individually?
Hi, your cast is invalid because each element of "array" is itself a JSONValue. You're even lucky to have something that resembles to the input ;) Try rather: --- import std.json, std.stdio, std.algorithm, std.array; void main() { JSONValue settings; settings = parseJSON(`{"int list" : [1,2,3,4,5]}`); // take the int value of each individal element to make the array. auto intList = settings["int list"].array.map!(a => a.integer).array; writeln(intList); } ---
Nov 15