The Truth About Truthy & Falsy

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

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