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Node.js v4 の話 #tng18
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Yosuke Furukawa
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October 08, 2015
Programming
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9.7k
Node.js v4 の話 #tng18
東京Node学園 18時限目で発表した Node.js v4 の話です
Yosuke Furukawa
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October 08, 2015
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Transcript
Node.js v4 @yosuke_furukawa
@yosuke_furukawa
Tokyo NodeFest 2012
None
I asked him …
%PZPVIBWFBQMBOUPSFMFBTF W /FYUZFBS NBZCF
Tokyo NodeFest 2012
Congrats!!!!
Node.js v4.x features
Lots of features………….
JavaScript Syntax/Features
ES2015
ES2015 • let/const • class • Map/Set/WeakMap/ WeakSet • Generators
• Binary/Octal literals • Symbol • Template String literals • String.prototype.repeat • @@toStringTag • Enhanced Object Literals • unicode literals • arrow functions
Your code will be changed in Node.js
MyEventEmitter // v0.12 ‘use strict’; var events = require(‘events’); var
util = require(‘util’); var EventEmitter = events.EventEmitter; var MyEventEmitter = function(data) { this.data = data; }; util.inherits(MyEventEmitter, EventEmitter); MyEventEmitter.prototype.intervalCheck = function() { var originalData = this.data; var _this = this; setInterval(function (){ if (originalData !== _this.data) { _this.emit(‘change’, new Date() + ‘: ’ + _this.data); originalData = _this.data; } }, 1000); }; module.exports = MyEventEmitter; DIFDLPXOPCKFDUQFSTFD
MyEventEmitter // v4.0 ‘use strict’; const events = require(‘events’); const
EventEmitter = events.EventEmitter; class MyEventEmitter extends EventEmitter { constructor(data) { this.data = data; } intervalCheck() { let originalData = this.data; setInterval(()=>{ if (originalData !== this.data) { this.emit(‘change’, `${new Date()}: ${this.data}`); originalData = this.data; } }, 1000); } } module.exports = MyEventEmitter;
MyEventEmitter // After v4.0 ‘use strict’; const events = require(‘events’);
const EventEmitter = events.EventEmitter; class MyEventEmitter extends EventEmitter { constructor(data) { this.data = data; } intervalCheck() { let originalData = this.data; setInterval(()=>{ if (originalData !== this.data) { this.emit(‘change’, `${new Date()}: ${this.data}`); originalData = this.data; } }, 1000); } } module.exports = MyEventEmitter; SFRVJSF͔ΒDPOTUͰఆٛ͢Δ ෆมͳͱͯ͠มߋ͞Εͳ͍Α͏ʹ͢Δ VUJMJOIFSJUTͷΘΓʹDMBTT FYUFOETΛ͏ BSSPXؔΛ͏ UFNQMBUFTUSJOHMJUFSBMͰจࣈྻ ݁߹Λॻ͘
MyEventEmitter // v0.12 ‘use strict’; var events = require(‘events’); var
util = require(‘util’); var EventEmitter = events.EventEmitter; var MyEventEmitter = function(data) { this.data = data; }; util.inherits(MyEventEmitter, EventEmitter); MyEventEmitter.prototype.intervalCheck = function() { var originalData = this.data; var _this = this; setInterval(function (){ if (originalData !== _this.data) { _this.emit(‘change’, new Date() + ‘: ’ + _this.data); originalData = _this.data; } }, 1000); }; module.exports = MyEventEmitter; // v4.0 ‘use strict’; const events = require(‘events’); const EventEmitter = events.EventEmitter; class MyEventEmitter extends EventEmitter { constructor(data) { this.data = data; } intervalCheck() { let originalData = this.data; setInterval(()=>{ if (originalData !== this.data) { this.emit(‘change’, `${new Date()}: ${this.data}`); originalData = this.data; } }, 1000); } } module.exports = MyEventEmitter; #FGPSF "GUFS ͖ͬ͢Γॻ͚ΔΑ͏ʹͳͬͨɻ
·ͩ • default params • rest/spread (ଟv5.0Ͱenable) • tail call
opts • Proxy • Reflect • modules ((ƅ㱼ƅ)ŋ㲎. ŞƄŰŕ!!)
Strong Script
Strong Script • ES6 ͷίʔυΛڧ੍ͤ͞ΔΈ • “use strong” σΟϨΫςΟϒΛॻ͘ •
node —strong_mode hoge.js Ͱىಈ • var Λ let/constʹม͑ͨΓɺdeleteެจΛ͏ͱౖΒΕͨ Γ͢Δɻ • experimental feature
“use strong” “use strong”; function foo() { // v8 4.2
enabled (io.js v2.0 also) var obj1 = ‘aaa’; // Restrict var (use let or const instead) let args = arguments; // Restrict arguments (use Rest Params …args) if (obj1 == ‘aaa’) {} // Restrict == (use strict equal ===) if (obj1 === ‘aaa’); // Restrict empty if and for for (let n in [1,2,3]) // Restrict for-in (use for-of instead) delete obj1.key // Restrict delete operator (use Map/Set instead) // v8 4.5 enabled TODO: try let undefined = ‘aaa’; // Restrict undefined binding let obj3 = { foo : ‘aaa’}; obj3.bar = ‘123’; // Restrict undefined property access }
DEMO
ৄ͘͠
ESIntl
ESIntl • ECMAScript ࠃࡍԽAPI • ECMA-402 / ௨শ ESIntl •
nodebuildͷ࣌ʹ’--with-intl=full-icu — download-all’Λࢦఆ͢Δͱ৽͘͠built-inΦ ϒδΣΫτͷIntlΦϒδΣΫτ͕༗ޮʹͳΔɻ
ESIntl
ESIntl 4USJOH OVN SFQMBDF aE aEaEaE aE H
DEMO
JavaScript Syntax/Features • ES2015ڧԽ • Strong Script͕࣮ݧతʹೖͬͯΔ • ࠃࡍԽAPI͕buildΦϓγϣϯࢦఆͰೖΕΒΕ ΔΑ͏ʹͳͬͨɻ
API
Buffer
Buffer • Buffer#indexOfϝιου͕Ճ • BufferͷϦϑΝΫλϦϯά͕ਐΈɺ ArrayBufferͰॻ͖͞ΕΔɻ • Bufferͷ܁Γฦ͠ʹfor/ofจ͕͑ΔΑ͏ʹ ͳΔɻ
Bufferࠓੲޠ • ͦͦBuffer v0.1.90Ͱ࣮͞Εͨ • ͦͷ࣌ArrayBufferଘࡏ͠ͳ͔ͬͨ • ్த͔ΒArrayBuffer͕༷Խ͞Ε࣮ͯ͞ΕͨͨΊࣅͨΑ͏ ͳػೳΛ࣋ͭAPI͕Ͱ͖ͯ͠·ͬͨɻ •
v4.0ͷλΠϛϯάͰv8͔ΒϝϞϦΛΞϩέʔτ͢Δؔ ͕deprecatedͱͳΓɺBufferΫϥεArrayBufferΫϥεΛҾ ͖ܧ͙ܗͰ࣮͞Εͨɻ
Buffer#indexOfϝιουͷՃ จࣈྻԽ͔ͯ͠ΒJOEFY0G͢ΔΑΓང͔ʹޮ͕ྑ͍ɻ
Buffer instanceOf ArrayBuffer "SSBZ#V⒎FSΫϥεͷΠϯελϯεΛͦͷ··ͤΔ
Buffer for/of var buf = new Buffer([1, 2, 3]); for
(var b of buf) console.log(b) // 1 // 2 // 3 #V⒎FS͕JUFSBUPSʹʂʂʂ
DEMO
Stream
Stream • Simple Stream Constructor͕Ͱ͖ͨ • StreamΛ࡞Δͷʹthrough2ͱ͔Λ͏ඞཁ ͕ͳ͘ͳͬͨ
Simple Stream Constructor // v0.12 var Transform = require('stream').Transform; var
util = require('util'); util.inherits(MyTransform, Transform); function MyTransform(opts){ Transform.call(this, opts); } MyTransform.prototype._transform = function(chunk, encoding, callback){ // ͜͜Ͱ มͯ͠ ... // push͢Δ this.push(chunk); }; MyTransform.prototype._flush = function(done){ // ࠷ޙʹԿ͔͚ͨ͠Ε͜͜Ͱ flush ͢Δ };
Simple Stream Constructor // v4.0 var transform = new stream.Transform({
transform: function(chunk, encoding, next) { // ͜͜Ͱ มͯ͠ ... // push͢Δ this.push(chunk); }, flush: function(done) { // ࠷ޙʹԿ͔͚ͨ͠Ε͜͜Ͱ flush ͢Δ } }); ؆୯ʂUISPVHIͱಉ͡ॻ͖ํʂʂ
REPL
REPL • historyΛηʔϒͯ͘͠ΕΔΑ͏ʹͳͬͨ • ී௨͚ͩͲɺΊͬͪΌخ͍͠
DEMO
OS
OS • os.homeDir()͕Ճ • ࠓ·ͰhomeσΟϨΫτϦऔΕͳ͔͚ͬͨͲ औΕΔΑ͏ʹͳͬͨ
API • BufferͷϦϑΝΫλϦϯάͱindexOfͷՃ • Stream͕γϯϓϧʹ࡞ΕΔΑ͏ʹͳͬͨ • REPL͕historyΛηʔϒͯ͘͠ΕΔΑ͏ʹͳͬ ͨ • os.homeDir()͕Ճ
Performance
require͕ߴԽ
require͕ߴԽ • ͜Ε·Ͱɺfs.statSyncͱfs.readFileSyncΛ ͕ͬͯͨɺstatSync͍͠ɺ readFileSyncຖճϓϩύςΟݺͼग़ͯ͠͠ Δͱएׯ͔͔࣌ؒΔɻ • ෦తʹߴͳAPI࡞ͬͨΒ50xߴԽ͞Ε ͨɻ
http͕ߴԽ
http͕ߴԽ • http-parser͕ΞοϓάϨʔυ͞ΕɺߴԽ͕ ೖΓɺ͞ΒʹhttpϞδϡʔϧ͕ߴԽ͞Εͨ
http͕ߴԽ • ϝϞϦར༻վળ
Performance • require͕50xߴԽ • http͕8%վળ • ϝϞϦޮΞοϓ
Deprecated
೦ͳ͕Βdeprecatedʹͳͬ ͨAPIୡ
domains
domainsΤϥʔΩϟον ग़དྷ͔ͯͦͬΒग़དྷΔ͜ͱ ͕গͳ͍ΑͶ… => deprecated
fs.exist/existSync
fs.existͰଘࡏ֬ೝͰ͖Δ͚ Ͳɺଘࡏ֬ೝͨ͠ޙʹผͳϓ ϩηε͔Βফ͞ΕͨΒͲ͏͢ Μͷʁ => deprecated
util.isXXXX
util.isXXX ͢ͱ͍
util.isObject ͕ functionΛ ObjectͱΈͳͯ͠ͳ͍ underscore/lodashͪΌΜ ͱ_.isObjectͰtrueʹͳΔ
࣮JSͷ༷తʹFunction ObjectͷҰͭ
मਖ਼͢Δͱmajor্͕ͬͪΌ ͏…
ͦͦཁΒͳ͘Ͷʁ => deprecated
Deprecated • domains • fs.exists • util.isXXXXX
Conclusion
Conclusion • ES.nextػೳڧԽ • API͕एׯύϫʔΞοϓ • ੑೳվળʂʂʂ • deprecatedͳAPIࠓޙΘͳ͍Α͏ ʹʂʂʂʂ