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

The Truth About Truthy & Falsy

Sponsored · SiteGround - Reliable hosting with speed, security, and support you can count on. →
Avatar for Swaroop SM Swaroop SM
April 10, 2015
Technology
61
1

The Truth About Truthy & Falsy

Deck demonstrating which values are truthy / falsy w.r.t a programming language.

Avatar for Swaroop SM

Swaroop SM

April 10, 2015

More Decks by Swaroop SM

See All by Swaroop SM
Client-Side Data Modelling and more...
Avatar for Swaroop SM swaroopsm
0
63
ReactJS Awesomeness
Avatar for Swaroop SM swaroopsm
3
260
Testing JavaScript like a "BOSS"
Avatar for Swaroop SM swaroopsm
0
68

Other Decks in Technology

See All in Technology
電子辞書Brainをネットに繋げてみた(自力編)
Avatar for らすぴー raspython3
0
190
Agentic AI時代における メルカリのAIガバナンスとガードレール実装
Avatar for ichihara naoichihara
15
15k
Copilot CLI・IDE・Web・スマホで途切れない開発フローを目指して / One Copilot flow - CLI IDE Web Mobile
Avatar for AEON aeonpeople
1
1.1k
個人AIからチームAIへ：開発における品質と生産性の再設計
Avatar for Atsushi Nakatsugawa moongift
PRO
0
160
GitHub Copilot CLI の Rubber Duck 機能を使ってコーディングの品質をあげよう #techbaton_findy
Avatar for すてにゃん stefafafan
2
1.1k
AI時代に求められる思考のパラダイムシフト
Avatar for NRI Netcom nrinetcom
PRO
1
160
食べログのサーキットブレーカー導入を振り返って
Avatar for atpons atpons
0
120
AIが変えた"品質の守り方"
Avatar for kkakizaki kkakizaki
12
4.4k
最低限これだけ押さえれ大丈夫_Claude Enterprise/Team企業展開ガバナンス入門
Avatar for t-kikuchi tkikuchi
1
180
自称宇宙最速で不合格となったAIP-C01にリベンジを果たすべくAIで問題集アプリを作ってみた。
Avatar for Yuuki Yamashita yama3133
0
210
はじめてのAI-DLC
Avatar for 吉田真吾 yoshidashingo
2
560
long-running-tasks
Avatar for cipepser cipepser
2
390

Featured

See All Featured
Stop Working from a Prison Cell
Avatar for Chris Michel hatefulcrawdad
274
21k
Scaling GitHub
Avatar for Zach Holman holman
464
140k
Un-Boring Meetings
Avatar for Sebastian Deterding codingconduct
0
300
ラッコキーワード サービス紹介資料
Avatar for ラッコ株式会社 rakko
1
3.4M
Music & Morning Musume
Avatar for Bryan Veloso bryan
47
7.2k
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
356
21k
How to Get Subject Matter Experts Bought In and Actively Contributing to SEO & PR Initiatives.
Avatar for Liv Day livdayseo
0
130
Code Reviewing Like a Champion
Avatar for maltzj maltzj
528
40k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
Avatar for Eileen M. Uchitelle eileencodes
38
2.9k
Navigating the moral maze — ethical principles for Al-driven product design
Avatar for Skipper Chong Warson skipperchong
2
370
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
508
140k
Balancing Empowerment & Direction
Avatar for Lara Hogan lara
6
1.1k

Transcript

  1. WTF (What’s Truthy Falsy) Swaroop SM Cybrilla Technologies

  2. - TRUTHY: If the value isn’t literally “true” but evaluates

    to true. - FALSY: If the value isn’t literally “false” but evaluates to false. What is it?

  3. undefined 0 false “” null NaN nil [] {} true

    True False None

  4. var a = 0; if(a) { alert(“I’m TRUTHY :)”); }

    else { alert(“I’m FALSY. Feel so proud. :D”); } The Confusion

  5. TRUTHY - true - 0 - “” - [] -

    {} Ruby FALSY - false - nil

  6. Ruby on Rails present? - !blank? - 0 - true

    blank? - nil - “” - [] - {} - false - whitespace

  7. Python TRUTHY - True - 1 FALSY - False -

    None - 0 - [] - “” - {}

  8. JavaScript TRUTHY - true - “0” - [] - {}

    FALSY - 0 - false - “” - undefined - null - NaN

  9. Thank You! @smswaroop http://www.github.com/swaroopsm/truthy-falsy