manifold-systems/manifold on Hacker News

…out.println(dude.getName()); out.println(dude.getAge()); out.println(dude.getAddress().getCity()); https://github.com/manifold-systems/manifold

comment by owlstuffing · 2026-07-23 · in JEP 540: Simple JSON API (Now in Incubator)

Analytics with type-safe raw SQL (including DuckDb’s awesome extensions) is pure gold: https://github.com/manifold-systems/manifold/blob/master/doc...

comment by owlstuffing · 2026-04-14 · in Design and implementation of DuckDB internals

…Manifold which is a compiler extension to Java that adds every little feature to the language. https://github.com/manifold-systems/manifold

comment by vips7L · 2026-04-08 · in Union types in C# 15

F# units are handy, but nothing like Manifold units (Java): https://github.com/manifold-systems/manifold/tree/master/man...

comment by owlstuffing · 2026-04-08 · in Union types in C# 15

…to implementation inheritance. The manifold project provides true delegation [1] for Java. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2026-03-18 · in Java 26 is here

…experiments with language-level delegation to make interface composition practical with Java. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2026-03-18 · in Java 26 is here

…type attribution phase does a binding expression's structure resolve based on the operand types. https://github.com/manifold-systems/manifold/tree/master/man... > in typical code you don’t have the case of constant values so often. Agreed.…

comment by owlstuffing · 2026-03-10 · in Rethinking Syntax: Binding by Adjacency

…blindly exploring every syntactic alternative. Here is the high-level explanation of the mechanism: https://github.com/manifold-systems/manifold/tree/master/man... But the short answer is that it’s not parser-style backtracking over a…

comment by owlstuffing · 2026-03-10 · in Rethinking Syntax: Binding by Adjacency

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Optional/Named Arguments for Java

story by owlstuffing · 2026-03-08 · 1 comment

…on their static types, forming new expressions through type-directed resolution. Details here: https://github.com/manifold-systems/manifold/blob/master/doc...

comment by owlstuffing · 2026-03-08 · in Rethinking Syntax: Binding by Adjacency

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Rethinking Syntax: Binding by Adjacency

story by owlstuffing · 2026-03-08 · 23 comments

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Type-Safe JDBC: Schema-First Native SQL in Java

story by owlstuffing · 2026-03-02 · 1 comment

Something parallel to this and completely amazing: manifold-sql[1]. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2026-02-18 · in Show HN: Pg-typesafe – Strongly typed queries for PostgreSQL and TypeScript

…modern language. Structural typing not so much, though. Java has it through a compiler extension ( https://github.com/manifold-systems/manifold/tree/master/man... ) but I don't know many other languages that support this feature. As much…

comment by jeroenhd · 2026-02-01 · in The history of C# and TypeScript with Anders Hejlsberg [video]

…LIMIT 3 """ .fetch() .forEach(row -> out.println(row.stationName + ": " + row.numServices)); 1. https://github.com/manifold-systems/manifold/blob/master/doc...

comment by owlstuffing · 2026-01-16 · in Why DuckDB is my first choice for data processing

…Manifold that provides type-safe SQL just like the author wants, with IDE support and everything: https://github.com/manifold-systems/manifold/blob/master/man...

comment by brabel · 2025-10-18 · in What Dynamic Typing Is For

…select * from film where release_year > :rel_year".fetch(year)) { out.println(film.title); } 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2025-07-29 · in SQLx – Rust SQL Toolkit

…on their static types, forming new expressions through type-directed resolution. Details here: [ https://github.com/manifold-systems/manifold/blob/master/doc... ]( https://github.com/manifold-systems/manifold/blob/master/doc... )

comment by owlstuffing · 2025-07-22 · in Rethinking Syntax: Binding by Adjacency

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Rethinking Syntax: Binding by Adjacency

story by owlstuffing · 2025-07-22 · 1 comment

…"Joe", age: 35); . . . Person p = person; // tuple's name, age properties satisfy Person record 1. https://github.com/manifold-systems/manifold

comment by owlstuffing · 2025-07-18 · in Row Polymorphic Programming

…types where function result types and parameter types define variance and other constraints. 1. https://github.com/manifold-systems/manifold

comment by owlstuffing · 2025-07-18 · in Row Polymorphic Programming

…Paired with manifold[1]--a Java library that makes it all type safe--and it's a game changer. 1. https://github.com/manifold-systems/manifold/blob/master/doc...

comment by owlstuffing · 2025-06-30 · in My Database Is My Application: Rethinking Webhook Logic with DuckDB and SQL

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Show HN: Toward Nirvana with Optional Parameters

story by owlstuffing · 2025-06-11 · 0 comments

…this via compiler plugin. The manifold-sql[1] module provides inline, type safe, native SQL. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2025-05-16 · in Show HN: SQL-tString a t-string SQL builder in Python

…manifold project for SQL[1], which has fantastic support for type-safe, native DuckDB syntax. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2025-04-25 · in Instant SQL for results as you type in DuckDB UI

…that muscles in operator overloading pretty comprehensively, and works with all LTS JDKs. 1. https://github.com/manifold-systems/manifold/tree/master/man...

comment by owlstuffing · 2025-04-19 · in Growing a Language [pdf] (1998)

…JSON, XML, SQL, GraphQL, and even other languages in a seamless, type-safe way. 1. https://github.com/manifold-systems/manifold

comment by owlstuffing · 2025-04-02 · in Why F#?

CSV is everywhere. I use manifold-csv[1] it’s amazing. 1. https://github.com/manifold-systems/manifold/tree/master/man...

comment by owlstuffing · 2025-03-26 · in A love letter to the CSV format

…m/s/s; // 49.035 Newtons Force f = 49.035 kg m/s/s; force == f // true force == 49.035 N // true 1. https://github.com/manifold-systems/manifold/tree/master/man... *

comment by owlstuffing · 2025-03-22 · in Frink

…a lot more capability. I’m using the manifold-sql[1] project with duckdb for analytics, amazing. 1. https://github.com/manifold-systems/manifold/blob/master/doc...

comment by owlstuffing · 2025-03-12 · in The DuckDB Local UI

For those wishing Java had a similar feature, there's Manifold: https://github.com/manifold-systems/manifold/tree/master/man... Manifold is a very interesting project that adds a lot of useful features to Java (operator overloading,…

comment by jeroenhd · 2025-03-09 · in Exploring Polymorphism in C: Lessons from Linux and FFmpeg's Code Design (2019)

…see it, particularly wrt the type system, to be taken seriously as a Java contender. Shrug. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2025-02-19 · in One year after switching from Java to Go

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Java: Optional Parameters and Named Arguments

story by owlstuffing · 2025-01-24 · 1 comment

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Show HN: Optional parameters and named arguments for Java

story by owlstuffing · 2025-01-22 · 0 comments

Something like manifold-sql[1] for ts would be awesome. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2024-12-06 · in Litdb – type safe SQL for JavaScript/TS

…my sentiments too. I was expecting type-safe SQL . The manifold-sql[1] project has this down. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2024-12-06 · in Litdb – type safe SQL for JavaScript/TS

…for SQL, but it’s obviously providing its own static metaprogramming layer over Java. Shrug. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2024-12-01 · in Rails is better low code than low code

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Type-Safe Data Science

story by owlstuffing · 2024-11-14 · 1 comment

…it. Something like project manifold[1] for the jvm world is in my view the way forward. Shrug. 1. https://github.com/manifold-systems/manifold

comment by owlstuffing · 2024-10-25 · in Show HN: TypeSchema – A JSON specification to describe data models

…support etc. to make working with and reading code using quantities more productive in Java. 1. https://github.com/manifold-systems/manifold/tree/master/man... 2. https://github.com/manifold-systems/manifold/tree/master/man...

comment by owlstuffing · 2024-10-09 · in Show HN: Kotlin Money

…the amounts separately and uses exchange rates only for spot display/calc, transfer, etc. 1. https://github.com/manifold-systems/manifold/tree/master/man...

comment by owlstuffing · 2024-10-08 · in Show HN: Kotlin Money

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Show HN: Paranormal Metaprogramming with Java

story by owlstuffing · 2024-10-08 · 0 comments

…does little to facilitate his position. The library mentioned here works toward a remedy[1]. 1. https://github.com/manifold-systems/manifold/blob/master/man...

comment by owlstuffing · 2024-09-29 · in Favor composition over inheritance for Java via True Delegation

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Favor composition over inheritance for Java via True Delegation

story by owlstuffing · 2024-09-29 · 1 comment

…provide, and innovates in some uniquely awesome ways like type-safe SQL, true delegation, etc. 1. https://github.com/manifold-systems/manifold

comment by owlstuffing · 2024-08-29 · in A Java language cumulative feature rollup

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Show HN: Native SQL, type-safe, in-lined. Pick three

story by owlstuffing · 2024-08-29 · 0 comments

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Show HN: GitHub Traffic CLI Tool

story by owlstuffing · 2024-08-09 · 0 comments