DC dcposch

😱😱

> var s = 'hello [object Object] null undefined'
> s.indexOf([])
0
> s.indexOf({})
6
> s.indexOf(null)
22

profiling JS array performance

what's the fastest way to make short-lived arrays in Javascript?

i need to make this array very often. variable length, from a couple to a couple thousand. i don't know each length ahead of time. i also want to minimize memory allocations.

options

really weird macOS bug

reasonable behavior on linux

dc@dc:/tmp$ mkdir foo
dc@dc:/tmp$ echo sup > foo/1
dc@dc:/tmp$ echo dawg > foo/2
dc@dc:/tmp$ echo yo > bar
dc@dc:/tmp$ cp -r foo/ bar


	public class Bulbs {
	public static void main(String[] args) {
	Board challenge = new Board(3);
	challenge.set(1, 0, true);

	System.out.println("CHALLENGE");
	System.out.println(challenge);

	System.out.println("SOLUTION");

	@keyframes fadein {
	from {
	opacity: 0;
	}
	to {
	opacity: 1;
	}
	}

	.app {

	// In both the main and renderer processes
	// For example, in both main/index.js and renderer/index.js
	var crashReporter = require('../crash-reporter')
	crashReporter.init()

	// Separately, create crash-reporter.js, shared by main and renderer:
	module.exports = {
	init
	}

	// In the main process, check whether the app is starting
	// because the user dragged files onto the app icon
	process.argv.forEach(onOpen)

	// Open handlers should be added on the first tick.
	// These fire if the app is already running and the user
	// drags files or URLs onto the dock icon, or if they set
	// the app as a handler for a file type and then open a file
	app.on('open-file', onOpen)
	app.on('open-url', onOpen)

	const win = new electron.BrowserWindow(...)

	// When work makes progress, show the progress bar
	function onProgress (progess) {
	// Use values 0 to 1, or -1 to hide the progress bar
	win.setProgressBar(progress \|\| -1) // Progress bar works on all platforms
	}

	// When work completes while the app is in the background, show a badge
	var numDoneInBackground = 0

	console.time('init')

	// require() calls and early initialization
	[...]

	var state = State.getInitialState()

	// `state.saved` is read from and written to a file. All other state is ephemeral.
	// First we load state.saved, once that is done, initialize the app.
	loadState(init)