迷渡 justjavac

## unicode.js
// JavaScript 字符串编码使用 UTF-16
"💩".length === 2;
"💩" === "\u{1F4A9}";    // es6
"💩" === "\uD83D\uDCA9"; // es5

// 同一个编码可能使用不同的码位
"ò" === "ò";       // ❎
"ò" === "\xF2";    // ✅
"ò" === "o\u0300"; // ✅
"o\u0300".normalize("NFC") === "\xF2"; // ✅ es6 提供了 normalize 函数

## mathias.js
"use strict";

// These are examples how to created PACKED_*_ELEMENTS arrays preinitialized
// in V8, following up on offline discussion at the last MunichJS meetup.

function createPackedViaArrayFrom(length, value) {
  return Array.from.call(null, Array.prototype.map.call({length}, _ => value));
}

function createPackedViaGenerator(length, value) {

## typedarray.js
function test() {
  const a = new Int32Array(10);
  for (let i = 0; i < 1e6; i++) {
    a.set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
  }
  return a;
}

console.time('test');
test();

## super-in-babel-typescript.js
"use strict";

class Point {
  getX() {
    console.log(this.x); // C
  }
}

class ColorPoint extends Point {
  constructor() {

## control_devices.dreamcode.js
// Ask the coffee machine at IP 192.168.2.2 to do its job
device('192.168.2.2')
.do( 'coffee' )
.then( wakeMeUpCallback )

// turn all lights on
device.findAll('light').do('turnOn')

## convert_dreamcode.js
// convert a dom element to a PDF and download it
convert( $('.invoice') ).to( 'invoice.pdf' ).download()

// alternatively
download( convert( $('.invoice') ).to( 'invoice.pdf' ) )

// convert another website to a png and show it on the page
convert( 'http://exam.pl/page' ).toImage().then( $('.screenshots').append )

// attach a file to an email

## share_dreamcode.js
// add a new share
share = new Share()

// grant / revoke access
share.grantReadAccess()
share.grantWriteAccess()
share.revokeReadAccess()
share.revokeWriteAccess()
share.grantReadAccess('joe@example.com')
share.revomeWriteAccess(['joe@example.com', 'lisa@example.com'])
	// JavaScript 字符串编码使用 UTF-16
	"💩".length === 2;
	"💩" === "\u{1F4A9}"; // es6
	"💩" === "\uD83D\uDCA9"; // es5

	// 同一个编码可能使用不同的码位
	"ò" === "ò"; // ❎
	"ò" === "\xF2"; // ✅
	"ò" === "o\u0300"; // ✅
	"o\u0300".normalize("NFC") === "\xF2"; // ✅ es6 提供了 normalize 函数
	"use strict";

	// These are examples how to created PACKED_*_ELEMENTS arrays preinitialized
	// in V8, following up on offline discussion at the last MunichJS meetup.

	function createPackedViaArrayFrom(length, value) {
	return Array.from.call(null, Array.prototype.map.call({length}, _ => value));
	}

	function createPackedViaGenerator(length, value) {
	function test() {
	const a = new Int32Array(10);
	for (let i = 0; i < 1e6; i++) {
	a.set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
	}
	return a;
	}

	console.time('test');
	test();
	"use strict";

	class Point {
	getX() {
	console.log(this.x); // C
	}
	}

	class ColorPoint extends Point {
	constructor() {
	// Ask the coffee machine at IP 192.168.2.2 to do its job
	device('192.168.2.2')
	.do( 'coffee' )
	.then( wakeMeUpCallback )

	// turn all lights on
	device.findAll('light').do('turnOn')
	// convert a dom element to a PDF and download it
	convert( $('.invoice') ).to( 'invoice.pdf' ).download()

	// alternatively
	download( convert( $('.invoice') ).to( 'invoice.pdf' ) )

	// convert another website to a png and show it on the page
	convert( 'http://exam.pl/page' ).toImage().then( $('.screenshots').append )

	// attach a file to an email
	// add a new share
	share = new Share()

	// grant / revoke access
	share.grantReadAccess()
	share.grantWriteAccess()
	share.revokeReadAccess()
	share.revokeWriteAccess()
	share.grantReadAccess('joe@example.com')
	share.revomeWriteAccess(['joe@example.com', 'lisa@example.com'])