Leveling Up Your Front-end skills

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Leveling Up Front-end Skills Yuya Saito @ Frontrend in Fukuoka #frontrend_ff

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Hands On Multi Tracks &

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Yuya Saito Frontend Developer @ CyberAgent

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Agenda Front-end Development is Easy!? ϑϩϯτΤϯυ։ൃ͸؆୯ No, it’s not! ϑϩϯτΤϯυ ɾ εΩϧΛϨϕϧΞοϓ͠Α͏ There are actually more… ͞ΒͳΔਂ෵΁ʜ How to learn all this? ϑϩϯτΤϯυ ɾ εΩϧͷֶͼํ

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Front-end Development is Easy!? ϑϩϯτΤϯυ։ൃ͸؆୯

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ͭͷڞ௨఺͕͋Δ HTML, CSS & JavaScript

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ͷߴ͞ Learnability

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WWW is Only 20 Years Old

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HTML

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< > TAG NAME

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TAG NAME About 100 of

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CSS

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selector { property: value; }

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selector { color: red; }

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JavaScript

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JavaScript ͸؆୯Ͱ͸ͳ͍ͷͰ͸

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function if var for {} while [] try {} catch (e) {}

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JavaScript ͸γϯϓϧͰ׮༰ͳݴޠ

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JavaScript ͸ϒϥ΢β͑͋͞Ε͹࣮ߦͰ͖Δ

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Learnability ͕ٕज़ͷ޿͕ΓΛੜΈग़ͨ͠ɻ

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No, it’s not! ϨϕϧΞοϓ͠Α͏ ϑϩϯτΤϯυ ɾ εΩϧΛ

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ϒϥ΢βͷ಺෦ߏ଄Λ஌Δ Browser Learn:

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Browser͸։ൃ؀ڥ

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Browser͸ϓϥοτϑΥʔϜ

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Browser͸ιϑτ΢ΣΞ

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html5rocks.com/en/tutorials/internals/howbrowserswork

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Google Chrome Developer Relations Paul Irish

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❞ As a web developer, learning the internals of browser operations helps you make better decisions and know the justiﬁcations behind development best practices. While this is a rather lengthy document, we recommend you spend some time digging in; we guarantee you'll be glad you did. - Paul Irish

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❞ ϒϥ΢β಺෦ͷಇ͖ΛֶͿࣄ͸ 8FC։ൃऀʹͱͬͯΑΓΑ͍ղܾΛߦ͏͜ͱɺ ͦͯ͠։ൃʹ͓͚ΔϕετϓϥΫςΟεͷഎޙʹ͋Δ ࠜڌΛཧղ͢Δ͜ͱʹͭͳ͕Γ·͢ɻ ͜ͷهࣄ͸௕͍΋ͷͰ͸͋Γ·͕͢ɺ গ࣌ؒ͠Λׂ͍ͯಡΜͰΈ͍ͯͩ͘͞ɻ ͦͷ͕࣌ؒແବʹͳΒͳ͍͜ͱ͸อূ͠·͢ɻ - Paul Irish

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chromium.org/developers/design-documents/gpu-accelerated-compositing-in-chrome

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ۜͷ஄ؙ͸ଘࡏ͠ͳ͍ɻ ͔͠͠஄ؙͦͷ΋ͷ͸ଘࡏ͍ͯ͠Δɻ ஄ؙͷબͼํΛֶͿ͜ͱ͕େ੾ɻ Learn:

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ߏ଄΍ઃܭͷํ๏Λ஌Δ JavaScript Learn:

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jQuery͚ͩͰ͸΋͸΍े෼Ͱ͸ͳ͍ɻ Not Just jQuery

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jQuery͸ͲΜͳ໰୊Λղܾ͠Α͏ͱ What jQuery is? ͍ͯ͠Δͷ͔

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JavaScriptʹ͓͚ΔΞϓϦͷઃܭ Architecture

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໾ׂ෼୲ΛͲ͏෼཭ɾ݁߹͢Δͷ͔ MV*

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Backbone.js Angular.js Ember.js ͦΕͧΕʹར఺ͱܽ఺͕͋Δɻ

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ίϝϯτΛؚΊͯ΋1,600ߦఔ౓ Read: Backbone.js

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TODOΞϓϦҎ֎ͷαϯϓϧΛ ࡞ͬͯΈΔɻ with Backbone.js

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Angular.jsͰॻ͖׵͑ͯΈΔɻ

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MV*͕ͲΜͳ໰୊Λ ղܾ͠Α͏ͱ͍ͯ͠Δͷ͔ Learn:

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Fail Fast Fail Often

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ߏ଄΍ઃܭͷํ๏Λ஌Δ CSS Learn:

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CSS: Style Layout Animation

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CSS needs Architecture, too ͦͷͨΊͷػೳ͸ଘࡏ͠ͳ͍ͱ͍͏ໃ६

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Learn: CSS Preprocessor

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CSS Preprocessor Learn: Doesn’t Solve it! CSSͷઃܭΛ༰қʹͯ͘͠ΕͨΓ͸͠ͳ͍

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OOCSS SMACSS BEM by Nicole Sullivan by Jonathan Snook by Yandex

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They’re just An Example. ͜ΕΒͷํ๏࿦͸͋͘·Ͱ΋ྫɻ

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ͳΜͲ΋܁Γฦ͞ΕΔɺ ͋Δ͍͸܁Γฦ͢͜ͱ͕Ͱ͖Δɺ ύλʔϯΛͲͷΑ͏ʹ ൃݟ͠ɺ ࣮૷͠ɺ ໋໊͢Δͷ͔ɻ

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by ୩ ୓थ 15:30~ @ ձٞࣨ5 Goal of Better CSS Architecture

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youtu.be/BlSFXdnuq5E

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Modularity Learn: ϞδϡϥʔԽΛ஌Δ

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More Than A Few Thousand Lines of Codes ਺ઍߦʹ΋ٴͿίʔυ΋௝͘͠ͳ͍ɻ

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ͳΜͷσβΠϯઃܭ΋ͳ͘ɺ ୯७ʹϑΝΠϧΛ෼ׂͯ͠࡞ۀΛߦ͑͹ ϖʔδϩʔυͷ࠷దԽͷجຊݪଇͰ͋Δɺ HTTPϦΫΤετΛ ૿΍͢͜ͱʹͳͬͯ͠·͏ɻ

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CSSͳΒ·ͩ͠΋ɺ JavaScriptʹ͸ղফ͠ͳ͚Ε͹ͳΒͳ͍ ґଘؔ܎΋࣮֬ʹଘࡏ͢ΔͰ͠ΐ͏ɻ

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Modular Design

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Module Design JavaScriptʹ΋CSSʹ΋ݱ࣌఺Ͱ͸ ͜ͷϒϩοΫ޻๏Λ࣮ݱ͢ΔͨΊͷ ػೳ͸ݴޠͱͯ͠༻ҙ͞Ε͍ͯͳ͍ɻ

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There are Tools (a lot)

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Require.js by James Burke

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Learn: Asynchronous Module Definition

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Require.js is Good But... Require.jsʹ΋໰୊͸͋Δ...

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Node.js IS JavaScript But... Node.jsͰ͸ฉ͔ͳ͍໰୊...?

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CommonJS

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Browserify.js by James Holiday AKA substack

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ES6 import / export

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CSS?

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Testing Learn: ϢχοτςετΛ஌Δ

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Linting is First Step to Test ·ͣLint͔Β࢝ΊΔ

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ࣗ৴Λ࣋ͬͯؒҧ͍Λਖ਼͢ ϫʔΫϑϩʔΛ࣋ͭɻ

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Refactoring

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Learn: Jasmine Mocha or

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CSS?

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CSS needs Testing

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Not Yet

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speakerdeck.com/studiomohawk/testable-javascript

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speakerdeck.com/studiomohawk/unit-testing-with-jasmine

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Performance Learn: ύϑΥʔϚϯεΛ஌Δ

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ύϑΥʔϚϯε͸ػೳ

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Tools, not Rules. - Paul Lewis

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ϕετ͕ৗʹϕετͱ͸ݶΒͳ͍ɻ

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-webkit-transform: translate3d(0,0,0);

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What we can measure, we can optimize! - Ilya Grigorik

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Network Panel

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Timeline Panel

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Profile Panel

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developers.google.com/chrome-developer-tools/

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There are actually more… ͞ΒͳΔਂ෵΁ʜ

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Quick Peek ͘͝؆୯ʹɻ

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Cross Brower Platform Device

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Test Early

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$49, Mac Only GhostLab

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github.com/shakyShane/browser-sync

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Progressive Enhancement

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ৗʹ৽͍ٕ͠ज़Λ࠾༻͢Δ͜ͱΛ ظ଴͞Εͳ͕Βɺ աڈͷϒϥ΢β΁ͷରԠΛഭΒΕΔໃ६ɻ

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Progressive Enhancement͸ ϑϩϯτΤϯυ։ൃऀͷಠஃ৔ɻ

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ϒϥ΢β΍σόΠεͰ੍ݶΛ ߟ͑ΔͷͰ͸ͳ͘ɺ ίϯϙʔωϯτ୯ҐͰઓུΛߟ͑Δɻ

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!lamentgroup.com/lab/grade_components/

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Template

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HTMLΛͦͷ··هड़͢Δ͜ͱ͕ ݮ͖͍ͬͯͯΔɻ

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No Choice on Server Side αʔόαΠυͷςϯϓϨʔτʹ͍ͭͯ͸ զʑʹબ୒ࢶ͕༩͑ΒΕΔ͜ͱ͸ͳ͍ɻ

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CMSΛؚΊͯɺ ϝδϟʔͳϑϨʔϜϫʔΫͰ ࠾༻͞Ε͍ͯΔςϯϓϨʔτݴޠʹ͍ͭͯ͸ ͓֮͑ͯ͘΂͖ɻ

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Too Many on Client Side ΫϥΠΞϯταΠυʹ͸΋͸΍ બ୒͢Δ͜ͱ͕೉͍͠΄Ͳଘࡏ͢Δɻ

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Handlebars.js Underscore.js

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Research

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Advocate for the Open Web Molly Holzschlag

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❞ If you want to be doing the same things for the next 10 years, you're in the wrong job. - Molly Holzschlag

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❞ ࣍ͷ೥ؒɺ ಉ͜͡ͱΛ͍͍ͯͨ͠ͱ ࢥ͏ͳΒɺ ͜ͷۀք͸޲͍͍ͯͳ͍ɻ - Molly Holzschlag

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Web will be always Changing.

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Inovation

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Self Learning

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Πϊϕʔγϣϯʹରͯ͠ ৗʹහײͰ͋Γ͚ͭͮΔ͜ͱ͸ ϑϩϯτΤϯυ։ൃऀͷ੹຿ɻ

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৘ใऩू͸श׳Խ͕伴ɻ

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How to learn all this? ϑϩϯτΤϯυ ɾ εΩϧͷֶͼํ

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֫ಘͰ͖Δͷ͔ Ͳ͏ͨ͠Β͜ΕΒͷεΩϧΛ

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ਫ਼௨͍ͯ͠Δͷ͔ ࢲࣗ਎͢΂ͯͷεΩϧʹ Better Question

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No.

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͋Δ͸ͣͰ͢ɻ օ͞Μʹ΋ಘҙͳδϟϯϧ͸ ूத͢Δ΂͖ɻ ·ͣ͸ͦ͜Λ৳͹͍ͯ͘͜͠ͱʹ

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T ❌

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ଞͷεΩϧʹֶ͍ͭͯͿඞཁੑ͕ Կ͔ͭͷεΩϧΛਂߞ͢Δ্Ͱɺ ඞͣग़͖ͯ·͢ɻ

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Homework Կ͕ಘҙͳͷ͔ Կʹڵຯ͕͋Δͷ͔

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What’s your Goal?

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Apple CEO Steve Jobs

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❞ You can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. - Steve Jobs

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❞ ઌΛಡΜͰ఺ͱ఺Λͭͳ͙͜ͱ͸Ͱ͖·ͤΜɻ ޙ͔ΒৼΓฦͬͯॳΊͯͰ͖ΔͷͰ͢ɻ ͦΕΒͷ఺͸ඞͣͲ͔͜ͷະདྷͰ ͭͳ͕Δ͜ͱΛ৴͡ͳ͚Ε͹ͳΒͳ͍ͷͰ͢ɻ - Steve Jobs