weihanglo

【譯】Rust vs. Go

本文譯自 Julio Merino 2018 年七月撰寫的 Rust vs. Go 一文。Julio Merino 是 G 社僱員，在 G 社工作超過 8 年，無論工作內外，都接觸開發不少 Go 語言，並撰寫 [Rust 點評][rust-review]系列文，來聽聽他對 Rust 與 Go 的想法吧。

Thanks Julio Merino for this awesome article!

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josh-hs-ko

-- programming

data Nat : Set where
  zero : Nat
  suc  : Nat → Nat

_+_ : Nat → Nat → Nat
zero  + n = n
suc m + n = suc (m + n)

swalkinshaw

Moved to Shopify/graphql-design-tutorial

gaearon

Note:

When this guide is more complete, the plan is to move it into Prepack documentation.
For now I put it out as a gist to gather initial feedback.

A Gentle Introduction to Prepack (Part 1)

If you're building JavaScript apps, you might already be familiar with some tools that compile JavaScript code to equivalent JavaScript code:

• Babel lets you use newer JavaScript language features, and outputs equivalent code that targets older JavaScript engines.

nolanlawson

Pinafore browser bugs

Chrome

• sticky element hit detection fails occasionally (nolanlawson/pinafore#1)
• video fullscreen in modal on Android forces landscape resize on entire document (no repro in iOS Safari, Firefox Android)
• modal with transform is blurry (nolanlawson/pinafore#71)

Edge

etienne-dldc

import React from 'react';

function onlyChild(children) {
  return Array.isArray(children) ? children[0] : children;
}

export function combineContext(contexts) {
  class Provider extends React.Component {
    render() {
      const init = this.props.children;

yelouafi

In this tutorial we're going to build a set of parser combinators.

What is a parser combinator?

We'll answer the above question in 2 steps.

1. What is a parser?
2. and, what is a parser combinator?

So first question: What is parser?

weihanglo

本文譯自 [Tokio internals: Understanding Rust's asynchronous I/O framework from the bottom up][tokio-internals]。
Thanks [David Simmons][david-simmons] for this awesome article!

[Tokio][tokio] 是 Rust 的開發框架，用於開發非同步 I/O 程式（asynchronous I/O，一種事件驅動的作法，可實現比傳統同步 I/O 更好的延伸性、效能與資源利用）。可惜的是，Tokio 過於精密的抽象設計，招致難以學習的惡名。即使我讀完教程後，依然不認為自己充分內化這些抽象層，以便推斷實際發生的事情。

從前的非同步 I/O 相關開發經驗甚至阻礙我學習 Tokio。我習慣使用作業系統提供的 selection 工具（例如 Linux epoll）當作起點，再轉移至 dispatch、state machine 等等。倘若直接從 Tokio 抽象層出發，卻沒有清楚了解 epoll_wait() 在何處及如何發生，我會覺得難以連結每個概念。Tokio 與 future-driven 的方法就好像一個黑盒子。

cscalfani

Monoids in Haskell, an Introduction

Why should programmers care about Monoids? Because Monoids are a common pattern that shows up over and over in programming. And when patterns show up, we can abstract them and leverage work we've done in the past. This allows us to quickly develop solutions on top of proven, stable code.

Add Commutative Property to a Monoid (Commutative Monoid) and you have something that can be executed in parallel. With the end of Moore's Law, parallelism is our only hope to increasing processing speeds.

What follows is what I've learned after studying Monoids. It is hardly complete, but hopefully will prove to be helpful as an introduction for others.

Monoid Lineage

ceejbot

ESM modules in node: npm edition

The proposal you’re about to read is not just a proposal. We have a working implementation of almost everything we discussed here. We encourage you to checkout and build our branch: our fork, with the relevant branch selected. Building and using the implementation will give you a better understanding of what using it as a developer is like.

Our implementation ended up differing from the proposal on some minor points. As our last action item before making a PR, we’re writing documentation on what we did. While I loathe pointing to tests in lieu of documentation, they will be helpful until we complete writing docs: the unit tests.

This repo also contains a bundled version of npm that has a new command, asset. You can read the documentation for and goals of that comma