Transcript
THE STORY OF A RAFFLERExtracting wisdom from stupidity
About me
Ramon de la Fuente
Future500 B.V.
@f_u_e_n_t_e
SweetlakePHP
–Edward de Bono
“The purpose of the book has been to shift attention from the problems themselves to the
way the mind tackles them”
Stupidity
The words "stupid" and "stupidity" entered the English language in 1541. Since then, stupidity has taken place along with "fool," "idiot," "dumb," "moron," and related concepts as a pejorative appellation for human misdeeds, whether purposeful or accidental, due to absence of mental capacity.
Stupidity is a quality or state of being stupid, or an act or idea that exhibits properties of being stupid.
Code experiment
• 1. Write throw-away code
• 2. That performs some function
• 3. Wait, what??
Domcode Raffler Rules
• 1. Accept a filename as the first CLI argument.
• 2. The file will contain a \n delimited list of names
• 3. Echo a single random name from the list
–Johnny Appleseed
“Type a quote here.”
Code experiment
• 1. Write a raffler
• 2. Using every “array_” function in PHP
• 3. Exactly once
Insight
Sequential
Strategic
Logical Thinking Lateral Thinking
Logical Thinking Lateral Thinking
A
B
C
A
B
C
Y
Logical Thinking Lateral Thinking
A
B…Y
Z
A
Z
C
Y
Evolution
Evolution
Evolution
Evolution
–Matt Groening
The Six Stages of Debugging
1. That can't happen.
2. That doesn't happen on my machine.
3. That shouldn't happen.
4. Why is that happening?
5. Oh, I see
6. How did that ever work?
The Six Stages of Debugging
1. That can't happen.
2. That doesn't happen on my machine.
3. That shouldn't happen.
4. Why is that happening?
5. Oh, I see
6. How did that ever work?
• It forces you to plan before you code.
• It virtually eliminates coder's block.
• Writing Unit tests will improve the design.
Test Driven Development?
Scenario: Starting a game
Given the dictionary provides "coconut" When I start a game using the dictionary
Then there should be 11 guesses available And the revealed word should be "_______"
Test Driven Development?
Scenario: Starting a game
Given the dictionary provides "coconut" When I start a game using the dictionary
Then there should be 11 guesses available And the revealed word should be "_______"
Test Driven Development?
Scenario: Starting a game
Given the dictionary provides "coconut" When I start a game using the dictionary
Then there should be 11 guesses available And the revealed word should be "_______"
Test Driven Development?
Problem Solving
Problem Solving
Problem Solving
Better solution
Problem Solving
Barely working solution
Problem Solving
Better solution
Problem Solving
Barely working solution
Problem Solving
Problem Solving
✓ ✗✓
Problem Solving
Problem Solving
Problem Solving
Problem Solving
SINGLETONS
GOTO
SERVICE LOCATOR
Problem Solving
SINGLETONS
GOTO
SERVICE LOCATOR
Problem Solving
Problem Solving
Problem Solving
Problem Solving
Problem Solving
–Edward de Bono
“Excellent thinking is of no use if based on an incorrect assumption”
Problem Solving
You solve a Rubik’s Cube layer by layer,
by applying fixed sequences of moves,
leaving previously solved layers intact.
Problem Solving
You solve a Rubik’s Cube layer by layer,
by applying fixed sequences of moves,
leaving previously solved layers intact.
a programming problem
general patterns
Building a Raffler
Building a Raffler
Building a Raffler
Building a Raffler
• Separate by return value
• Add complexity score
• Group similar functions together
• Create composable blocks
Building a Raffler
Building a Raffler
Building a Raffler
/* returns original array */
.
Building a Raffler
Building a Raffler
Building a Raffler
Building a Raffler
Building a Raffler
Relevance?
Relevance?
“…do I use this interface, or not?”
– Senior developer
Relevance?
“…do I use this interface, or not?”
– Junior developer
Relevance?
“…I don’t understand how this can happen”
“…how could I make this happen??”
Further reading
“Experience is a museum for mistakes”
– Edward de Bono
Feedback on Joind.in: 16863@f_u_e_n_t_e
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