add new data type, Node

src/hncore/Node.zig

@@ -0,0 +1,33 @@
+const std = @import("std");
+
+pub const Node = struct {
+    id     : usize,
+    summary: []const u8,
+
+    ///
+    pub fn init(alloc: std.mem.Allocator, id: usize, summary: []const u8) !Node {
+        return .{
+            .id        = id,
+            .summary   = try alloc.dupe(u8, summary),
+        };
+    }
+    /// pass the same allocator as init() call
+    pub fn deinit(self: *@This(), alloc: std.mem.Allocator) void {
+        alloc.free(self.summary);
+    }
+};
+
+test "serialize" {
+    const alloc = std.testing.allocator;
+    var   node  = try Node.init(alloc, 0, "helloworld");
+    defer node.deinit(alloc);
+
+    var json = std.ArrayList(u8).init(alloc);
+    defer json.deinit();
+    try std.json.stringify(node, .{}, json.writer());
+
+    try std.testing.expectEqualStrings(
+        json.items,
+        \\{"id":0,"summary":"helloworld"}
+    );
+}