Coding Fast and Slow
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Prof. Daniel Kahneman Mar 5, 1934 – Mar 27, 2024
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“for having integrated insights from psychological research into economic science, especially concerning human judgment and decision-making under uncertainty”
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Economics? × × × × ECON101: People are rational; that’s why markets work. - Nope, they aren’t; here’s 50 years of study. - Oh, wow, they really aren’t. It probably has a profound effect on economics! Here’s a Nobel Prize for ya! ECON101: People are rational; that’s why markets work.
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A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?
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How much does the ball cost? 0.10 + (1.00+0.10) = 1.20 0.05 + (1.00+0.05) = 1.10
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Baruch Sadogursky - @jbaru ch × Head of DevRel at TuxCare (I am hiring!) × Developer Productivity Nerd × Development -> DevOps -> #DevProd
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shownotes × × × × speaking.jbaru.ch Slides Video All the links!
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Two systems x x x x x Fast Intuitive Automatic Emotional Cheap and eager x x x x x Slow Analytical Controlled Logical Expensive and lazy
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Wait, let’s think about that! I recognize this pattern!
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class UniqueWords { public static void main(String[] args) throws IOException { if (args.length != 1) { throw new IllegalArgumentException(“Invalid argument”); } Set<String> words = new HashSet<>(); for (String line : Files.readAllLines(Path.of(args[0]))) { // Ignore commented lines if (!line.startsWith(“#”) || !line.startsWith(“//”)) { Collections.addAll(words, line.split(“\W+”)); } } System.out.println(”Count of unique words: ” + words.size()); } }
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You have “mental fuel”
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Attention and Capacity Limits in Perception: A Cellular Metabolism Account × × × × BNIRS and oxCCO Cellular Metabolism as Mental Fuel Finite Energy Supply High Load Mode vs Low Load Mode
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Which system do we use for co d ing? x x x x x Fast Intuitive Automatic Emotional Cheap and Eager x x x x x Slow Analytical Controlled Logical Expensive and Lazy
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effortless
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public class DiscountCalculator { public static void main(String[] args) { calculateDiscount(100, 15); } public static void calculateDiscount(double price, double discount) { double finalPrice = price - (price * discount / 100); System.out.println(“The final price after a ” + discount + “% discount is: ” + finalPrice); } }
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How Many Triangles?
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public class TaxCalculator { public static void main(String[] args) { calculateTax(100, 5); } } public static void calculateTax(double amount, double taxRate) { double totalAmount = amount + (amount * taxRate); System.out.println(“The total amount with tax: ” + totalAmount); }
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The problem: × You deplete your fuel by contextswitching × You’re not in the flow because of context-switching × Loose-loose: you need more fuel needed, but you have less fuel
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When we are tired, we produce worse code × “Developers are cutting corners on quality when fatigued.” (duh)
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But We don’t know when to qu x x x x it Default parole decision: deny Fewer paroles when judges are tired/hungry Granting parole needs System 2 thinking Judges unaware of switching to System 1
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Real-life outcome: you run on system one x x x x x Fast Intuitive Automatic Emotional Cheap and Eager x x x x x Slow Analytical Controlled Logical Expensive and Lazy
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Real-life outcome: you run on system one x x x x x Fast Intuitive Automatic Emotional Cheap and Eager x x x x x Slow Analytical Controlled Logical Expensive and Lazy
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× × × × × 10,000 hours of practice mov e some system 2 activities to sy stem 1 Driving Golf Tennis Music playing Safety drills for fire fighters
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Wait, let’s think about that! I recognize this pattern!
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Real-life outcome: you run on system one x x x x x Fast Intuitive Automatic Emotional Cheap and Eager x x x x x Slow Analytical Controlled Logical Expensive and Lazy
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Which sucks less? Bad code “OK” code
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The problem of “ok code” It looks “OK” to us System 1 It looks “OK” to PR review System 1 It looks “OK” to pipelines System 1
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Next thing you know: You have an “ok” product
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Invest in The goal: Have enough mental fuel to last all day
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Time Management Strategies × Time Blocking × Pomodoro Technique
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Time Management Strategies × Time Blocking × Pomodoro Technique × Task Batching
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× Block time × Batch tasks × Allow access
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Mindfulness and Cognitive Pra ctices × Mindfulness and Meditation × Reflective Practices × Single-tasking
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Workspace and Interruption M anagement × Workspace Organization × Notification Management × Prioritization Techniques
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Physical and Mental Well-bein g × Physical Exercise × Breaks and Downtime
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Caffeine nap Drink caffeine Dark, cold, quite room Set alarm to 20 minutes Reserves taped!
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Coding practices × Automate everything × Shorten feedback loops × Delegate to tools!
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Use AI smartly! Right tool – right job Not all tools are created equal. Go deep, not wide ATM specialized beats generalized Local ai = control Better control and privacy.
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Agentic AI is RAD if it does the right thing
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Coding practices × × × × Automate everything Shorten feedback loops Delegate to tools! Delegate to pros!
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when to delegate No Is it easy to learn? Do you have time to learn it? Delegate! Is the task your core expertise? No No Yes Yes Yes Learn it! Do it!
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Save mental fuel! × × × × × Time management Workspace management Mental wellbeing Engineer fewer interruptions Delegate when needed
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THANKS! Q&A and Twitter X/Bsky/Mastodon/LinkedIn ads: x @jbaruch x @Geecon x speaking.jbaru.ch
