Reading JSON

// longer version:

import std.stdio;
import std.json;

void main()
{
    string jsonStr = `["Adam", "Bob", "Cleo"]`;

    JSONValue jsonObj = parseJSON(jsonStr);

    foreach (item; jsonObj.array)
    {
        string name = item.str;
        writeln(name);
    }
}

// shorter version:

import std.stdio;
import std.json;
import std.algorithm; // map()
import std.array; // .array()

void main()
{
    string jsonStr = `["Adam", "Bob", "Cleo"]`;

    auto jsonObj = parseJSON(jsonStr);

    string[] names = jsonObj.array.map!(item => item.str).array;
    foreach (name; names)
    {
        writeln(name);
    }
}

// common part

import std.stdio;
import std.json;
import std.algorithm; // map()
import std.array; // .array()

void main()
{
    string jsonStr = `
{
    "last": "Doe",
    "first": "John",
    "age": 39,
    "sex": "M",
    "registered": true,
    "salary": 70000,
    "daughter": {
        "first": "Jane",
        "sex": "F",
        "age": 18
    }
}
`;
    auto jsonObj = parseJSON(jsonStr);
}

foreach (key, value; jsonObj.object)
{
    writeln(key, " -> ", value);
}

long age = jsonObj["age"].integer;
writeln(age); // 39

bool status = jsonObj["registered"].boolean;
writeln(status); // true

long daughterAge = jsonObj["daughter"]["age"].integer;
writeln(daughterAge); // 18

// alternative way:

string first = jsonObj["first"].get!string;
writeln(first); // John

int age = jsonObj["age"].get!int;
writeln(age); // 39

bool status = jsonObj["registered"].get!bool;
writeln(status); // true

int daughterAge = jsonObj["daughter"]["age"].get!int;
writeln(daughterAge); // 18