Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
eater
Search
Yosuke Furukawa
PRO
April 26, 2016
Programming
2
1.3k
eater
node 学園付属小学校の2回目で話した eater の話です。
Yosuke Furukawa
PRO
April 26, 2016
Tweet
Share
More Decks by Yosuke Furukawa
See All by Yosuke Furukawa
Node.js, Deno, Bun 最新動向とその所感について
yosuke_furukawa
PRO
9
3.7k
Welcome JSConf.jp 2024
yosuke_furukawa
PRO
1
4.1k
tc39 x jsconf.jp Panel Discussion 2024
yosuke_furukawa
PRO
0
230
Removing Corepack
yosuke_furukawa
PRO
9
1.6k
JavaScript Runtime とはなにか
yosuke_furukawa
PRO
15
2.8k
Strip Types と Storage
yosuke_furukawa
PRO
4
410
Module Harmony について
yosuke_furukawa
PRO
3
1.7k
LTのやり方
yosuke_furukawa
PRO
16
2.6k
AppRouter Panel Talk
yosuke_furukawa
PRO
3
810
Other Decks in Programming
See All in Programming
猫と暮らす Google Nest Cam生活🐈 / WebRTC with Google Nest Cam
yutailang0119
0
100
Blazing Fast UI Development with Compose Hot Reload (droidcon New York 2025)
zsmb
1
280
PicoRuby on Rails
makicamel
2
120
VS Code Update for GitHub Copilot
74th
2
620
Discover Metal 4
rei315
2
120
Goで作る、開発・CI環境
sin392
0
210
『自分のデータだけ見せたい!』を叶える──Laravel × Casbin で複雑権限をスッキリ解きほぐす 25 分
akitotsukahara
2
620
C++20 射影変換
faithandbrave
0
570
チームで開発し事業を加速するための"良い"設計の考え方 @ サポーターズCoLab 2025-07-08
agatan
0
180
Is Xcode slowly dying out in 2025?
uetyo
1
260
Team operations that are not burdened by SRE
kazatohiei
1
300
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
1
8.3k
Featured
See All Featured
Thoughts on Productivity
jonyablonski
69
4.7k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
VelocityConf: Rendering Performance Case Studies
addyosmani
332
24k
Making the Leap to Tech Lead
cromwellryan
134
9.4k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.5k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
8
680
Automating Front-end Workflow
addyosmani
1370
200k
The Invisible Side of Design
smashingmag
301
51k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
126
52k
Transcript
Eater @yosuke_furukawa
@yosuke_furukawa
Hello, Noders. This is Full-time Papa committer
None
child_process.spawn()
None
Node Quiz
Quiz: child_process API ͷԼهͷ ҧ͍ԿͰ͠ΐ͏ 1. exec 2. spawn 3.
fork
A: spawn ͕Ұ൪ϩʔϨϕϧ exec/fork spawn ͷ wrapper
A: exec callback Ͱड͚Δɺ fork JavaScript ͷίʔυ Λ
Node.js ͱͯ͠࠶࣮ߦ͢Δ
child_process.spawn const spawn = require('child_process').spawn; const ls = spawn('ls', [‘-al']);
ls.stdout.on('data', (data) => { console.log(data); }); ls.stderr.on('data', (data) => { console.log(data); }); ls.on('exit', (code) => { if (code !== 0) console.error(`Error occurred`); });
child_process.exec const exec = require('child_process').exec; exec(‘ls -al‘, (err, stdout, stderr)
=> { console.log(`${stdout}`); console.error(`${stderr}`); if (error !== null) { console.error(`Error occurred`); } });
child_process.fork const fork = require('child_process').fork; const ls = fork(‘ls.js’); ls.stdout.on('data',
(data) => { console.log(data); }); ls.stderr.on('data', (data) => { console.log(data); }); ls.on('exit', (code) => { if (code !== 0) console.error(`Error occurred`); });
spawn > exec ͜ͷॱͰ simple exec > spawn ͜ͷॱͰ easy
spawn > fork ͜ͷॱͰ simple fork > spawn ͜ͷॱͰ easy
Easy / Simple ͷҧ͍
None
Simple !== Easy
Simple is “୯७” ٬؍తɺҰͭͷࣄ͔͠͠ͳ͍
Easy is “؆୯” ओ؍తɺ”୭͔”ʹͱͬͯ؆୯ “୭ʹͱͬͯ؆୯” ଘࡏ͠ͳ͍
ॳ৺ऀ͕ؕΓ͕ͪͳࣄɿ Easy ͷݴ༿ʹὃ͞Ε͕ͪ ୭ʹͱͬͯEasy ͳΜͯ͋Γ ͑ͳ͍
ॳ৺ऀ͕ؕΓ͕ͪͳࣄɿ Simple ͱ Easy Λࠞಉ͍ͯ͠ Δʹࠔ͞Ε͕ͪ
Eater
Eater is *Ea*sy *t*est runn*er*
Eater has one simple rule If test file outputs `stderr`
message, the test failed.
Easy => ୭ʹͱͬͯʁ `node` ͔͠Βͳ͍Α͏ͳਓ mocha/jestͷࡉ͔͍ߏจΛ֮ ͑ͯͳͯ͘ɺnode ίϚϯυ ͰεΫϦϓτͱ࣮ͯ͠ߦ͢Δ ͚ͩͰΠφϑͳਓ
Eaterͷtest script `node` command Ͱ࣮ߦͰ͖Δ
Easy => ୭ʹͱͬͯʁ mock/spyΛଟ༻͢Δ͚Ͳɺ mock/spyͷ։์࿙ΕΛΕ ͕ͪͳਓʹͱͬͯ
EaterͷtestҰͭҰ͕ͭผϓ ϩηεͰ࣮ߦ͞ΕΔ
mockΛ։์͠ͳͯ͘OK // you don’t need to fix mock/spy console.log =>
(message) { assert(message.match(/Foo Bar/)); }; const mockDate = new Date(2016, 3, 9); Date.now = () => { return mockDate.valueOf(); }; process.exit => (exitcode) { assert(exitcode === 1); };
͔͠ϓϩηείΞͰ ಄ଧͪʹͳΔ eater ——procs 4 ※procs optionͰՄม
Eater DEMO https://github.com/yosuke- furukawa/eater-demo
Happy Eater https://github.com/yosuke- furukawa/eater