Miguel Costa
"A serious and good philosophical work could be written consisting entirely of jokes."
Fun with Development
(regarding variable names) If you can't pronounce it, you can't discuss it without sounding like an idiot. (...) This matters because programming is a social activity.
-- Bob Martin (Clean Code, chapter 2)
Variable names should be
PRONOUNCEable and SEARCHable
Don’t be afraid to make a name long. A long descriptive name is better than a short
enigmatic name. A long descriptive name is better than a long descriptive comment.
Clean Code, chapter 3, section "Use descriptive names" (page 70)
Don’t be afraid to spend time choosing a name (...) Modern IDEs like Eclipse or IntelliJ make
it trivial to change names.
Naming - Avoid mental mapping
- variable names shouldn't have to be translated
- single-letter names for some loop counters ONLY!
- use terms related to the problem or solution domains
- (personal note) don't lie! (shamelessly copy code without adapting names)
- "clarity is king" - smart programmer vs professional programmer
- "clarity over entertainment" - "deleteItems" vs "unleashTheKraken", which is clearer?
"There can be no worse reason for using the name c than because a and b were already taken" -- Bob Martin, chapter 2
Anything that forces you to check the function signature is equivalent to a double-take. It’s a cognitive break and should be avoided.
Functions should either do something or answer something, but not both. Either your function should change the state of an object, or it should return some information about that object (command query separation)
Functions should do one thing. Error hand(l)ing is one thing
(...) if the keyword try exists in a function, it should be the very first word
(...) there should be nothing after the catch/finally blocks
public void delete(Page page) { try { deletePageAndAllReferences(page); } catch (Exception e) { logError(e); } } private void deletePageAndAllReferences(Page page) throws Exception { deletePage(page); registry.deleteReference(page.name); configKeys.deleteKey(page.name.makeKey()); } private void logError(Exception e) { logger.log(e.getMessage()); }
Summary
- Interesting quotes to share
- Fun examples to learn basics and details
Make programming appealing on many levels (beginner and intermediate)
Wanna learn...
JavaScript?
JS - Code Monkey
('b' + 'a' + + 'a' + 'a').toLowerCase()Hints
('b' + 'a' + + 'a' + 'a') // baNaNa
('b' + 'a' + + 'a') // baNaN
('ba' + + 'a') // baNaN
('a' + + 'a') // aNaN
( + 'a') // NaNAnswer: "banana"
JS - The Brown Knight
new Array(16).join('wat' - 1) + ' ??????' Explanation
'wat' + 1 // 'wat1'
'wat' - 1 // NaN
'wat' - 1 + 'wat' - 1 // 'NaNNaN' (string)
new Array(4) // [, , ,]
new Array(4).join('wat') // 'watwatwat' (3)
new Array(4).join('wat' + 1) // 'wat1wat1wat1'
new Array(4).join('wat' - 1) // 'NaNNaNNaN'
Answer: = 'NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN Batman'
JS - Pair of arrays glasses
[] + []
{} + {}explanation by
Answer: "" and NaN
JS - Eye patches
[] + {}
{} + []explanation by
Answers: "[Object object]" (string) and 0
Explanation
Wanna learn...
Ruby?
Ruby - Smoke and mirrors
# with 'a' undefined...
a = a
explanation by
Answer: Nil (error not thrown)
Try to interpret or build something
VERY SIMPLE
... in a weird programming language
- Rockstar
- Brainf*ck
He is a developer Done is his limit While he is not Done Build He up Shout he
What's this output in Rockstar?
Build something weird and dumb...
Inspired by Sara Vieira's talk, "Build dumb sh*t"... and by Tim Holman, and ???, and myself!
Try to interpret or build something
VERY SIMPLE
... in a weird programming language
Midnight takes your heart and your soul While your heart is as high as your soul Put your heart without your soul into your heart Give back your heart Desire is a lovestruck ladykiller My world is nothing Fire is ice Hate is water Until my world is Desire, Build my world up If Midnight taking my world, Fire is nothing and Midnight taking my world, Hate is nothing Shout "FizzBuzz!" Take it to the top If Midnight taking my world, Fire is nothing Shout "Fizz!" Take it to the top If Midnight taking my world, Hate is nothing Say "Buzz!" Take it to the top Whisper my world
FizzBuzz in Rockstar (up to 100)
Sources
Fun with Development
Have fun and learn Programming
By Miguel Costa
Have fun and learn Programming
It's easier to keep learning if you're having fun doing it!
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