Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Safe Navigation in Ruby 2.3

Sponsored · Ship Features Fearlessly Turn features on and off without deploys. Used by thousands of Ruby developers. →
Avatar for Rick Liu Rick Liu
January 22, 2016
Programming
74
0

Safe Navigation in Ruby 2.3

Introduction the new operator and its problem.

Avatar for Rick Liu

Rick Liu

January 22, 2016

More Decks by Rick Liu

See All by Rick Liu
Functional Programming Concepts
Avatar for Rick Liu rickliu
0
230
You Don't Need a JavaScript Framework
Avatar for Rick Liu rickliu
0
130
Agile Design
Avatar for Rick Liu rickliu
0
85
Active Job in Rails 4.2
Avatar for Rick Liu rickliu
0
65

Other Decks in Programming

See All in Programming
Dockerfile CMD for Node.js
Avatar for Ohno Keita grazie1999
0
110
AI Engineeringは、AIプロダクトだけのものか？ 〜AIがソフトウェアを作る時代の新しい当たり前〜 / No AI in your product. AI Engineering in your development.
Avatar for r-kagaya rkaga
4
490
関東Kaggler会_NVIDIA_Nemotron_コンペ_振り返り
Avatar for rick rick_ds
0
670
使いながら育てる Claude Code — 開発フローの1コマンド化 × 繰り返し指摘の自動仕組み化
Avatar for endo shiki shiki_kakaku
0
1.9k
AIと壁打ちしながら進めるコスト管理
Avatar for Ryoma Fujiwara fufuhu
0
970
夏だ！祭りだ！祭りとはドメインモデリングでは？
Avatar for ryugen04 ryugen04
0
340
freee が目指す データ マネジメント戦略 AI-Ready 時代を支える 攻めのガバナンスとは
Avatar for freee freee
PRO
0
440
2年かけて Deno に DOMMatrix を実装した話 / How I implemented DOMMatrix in Deno over two years
Avatar for petamoriken / 森建 petamoriken
0
210
為什麼你並不需要ViewModel / No, you don't need a ViewModel
Avatar for Elvis Shi lovee
1
500
Android CLI
Avatar for Sungyong An fornewid
0
230
<title><a id="</title>君はこのHTMLをパースできるか"></a></title> #雑LT_study
Avatar for pizzacat83 pizzacat83
0
160
Claude CodeとAgentCore Gatewayを繋ぐ際の認証認可 / Authentication and authorization when connecting Claude Code with AgentCore Gateway
Avatar for Har1101 har1101
2
340

Featured

See All Featured
Visual Storytelling: How to be a Superhuman Communicator
Avatar for David Neal reverentgeek
2
620
Facilitating Awesome Meetings
Avatar for Lara Hogan lara
57
7.1k
Measuring Dark Social's Impact On Conversion and Attribution
Avatar for Stephen Akadiri stephenakadiri
2
260
Agile Actions for Facilitating Distributed Teams - ADO2019
Avatar for Mark Kilby mkilby
0
260
Jess Joyce - The Pitfalls of Following Frameworks
Avatar for Tech SEO Connect techseoconnect
PRO
1
370
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
Avatar for mongodb mongodb
49
10k
Mind Mapping
Avatar for Hélio Medeiros helmedeiros
PRO
1
320
Intergalactic Javascript Robots from Outer Space
Avatar for Vicent Martí tanoku
273
27k
Code Reviewing Like a Champion
Avatar for maltzj maltzj
528
40k
Fantastic passwords and where to find them - at NoRuKo
Avatar for Phil Nash philnash
52
3.8k
Max Prin - Stacking Signals: How International SEO Comes Together (And Falls Apart)
Avatar for Tech SEO Connect techseoconnect
PRO
0
420
Sharpening the Axe: The Primacy of Toolmaking
Avatar for Bryan Cantrill bcantrill
46
2.9k

Transcript

  1. Safe Navigation in Ruby 2.3

  2. Safe Navigation > some_array.first.positive? > [].first.positive? (value = some_array.first) &&

    value.positive? > some_array.first&.positive? # => true # => NoMethodError: undefined method `positive?' for nil:NilClass # => nil

  3. Safe Navigation if user.account && user.account.trial?
 # process trial account

    settings
 end if user.account&.trial?
 # process trial account settings
 end if user.account && user.account != previous_account
 # setup new account
 end if user.account &.!= previous_account
 # setup new account
 end &.&, &.<<, and &.+