niceSprite iFwu

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

ES6 Module Loading in Node.js

Guiding Principles

The solution must be 100% backward-compatible.
In the far future, developers should be able to write Node programs and libraries without knowledge of the CommonJS module system.
Module resolution rules should be reasonably compatible with the module resolution rules used by browsers.
The ability to import a legacy package is important for adoption.

Design Summary

Uninstall brew package and dependencies

Remove package's dependencies (does not remove package):

brew deps [FORMULA] | xargs brew remove --ignore-dependencies

Remove package:

Eric Elliott's "Composing Software" Series

A collection of links to the excellent "Composing Software" series of medium stories by Eric Elliott.

Edit: I see that each post in the series now has index, previous and next links. However, they don't follow a linear flow through all the articles with some pointing back to previous posts effectively locking you in a loop.

Fully Exhaustive Swift State Machine

The following is a nice Swift pattern to make a vanilla Swift state machine:

class Machine {
  enum State {
    case foo
    case bar(String)
    case baz(Int)

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

	var webpack = require('webpack');
	var MemoryFS = require('memory-fs');
	var SingleEntryDependency = require('webpack/lib/dependencies/SingleEntryDependency');
	var fs = new MemoryFS();

	fs.mkdirpSync('/src');
	fs.writeFileSync('/src/app.js', 'require("./dep.js")', 'utf-8');
	fs.writeFileSync('/src/dep.js', 'module.exports = function(msg){console.log(msg)}', 'utf-8');
	fs.writeFileSync('/src/extra-entry.js', 'require("./dep.js")', 'utf-8');

	# -- coding:utf-8 --

	import csv


	csv_file = "~/1.csv"
	new_file = "~/2.csv"
	row_one = ["账户","转账","描述","交易对象","分类","日期","时间","金额","支票号码"]

	// nb. This code is available in an ES module of Promise helpers, here:
	// https://github.com/samthor/promises

	// symbol returned to indicate that a call was cancelled
	export const takeoverSymbol = Symbol('takeover');

	/**
	* Accepts a generator function, which yields Promises, and converts it to an async function
	* that cancels any previous calls.
	*/

	function validURL(str) {
	var pattern = new RegExp(
	'^(https?:\\/\\/)?' + // protocol
	'((([a-z\\d]([a-z\\d-][a-z\\d]))\\.)+[a-z]{2,}\|' + // domain name
	'((\\d{1,3}\\.){3}\\d{1,3}))' + // OR ip (v4) address
	'(\\:\\d+)?(\\/[-a-z\\d%_.~+])' + // port and path
	'(\\?[;&a-z\\d%_.~+=-]*)?' + // query string
	'(\\#[-a-z\\d_]*)?$',
	'i'
	); // fragment locator