Add opt* methods to std.json

[dlangBugzillaToGithub]

andre reported this on 2019-11-11T20:17:48Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=20385

CC List

• greeenify

Description

Working with optional attributes in JSON is quite inconvenient to write:

Stream stream = {
    appId : js["appId"].str,
    // like this
    appVersion : js.object.get("appVersion", JSONValue("")).str,
    // or that
    startTimestamp : ("startTimestamp" in js is null) ? "" : js["startTimestamp"].str,
};


Adding opt* methods like optStr(string key, defaultValue = string.init) would make the usage a lot more readable:

Stream stream = {
    appId : js["appId"].str,
    appVersion : js.optStr("appVersion", "1.0"),
    startTimestamp : js.optStr("startTimestamp")
};

[dlangBugzillaToGithub]

greeenify commented on 2019-11-13T01:47:21Z

std.json (and most of Phobos is maintainance-only).

The planned next version of std.data.json is here:

https://github.com/dlang-community/std_data_json