Modern developers obsess over “small functions” and “single responsibility.” In my 47 years of crafting unmaintainable masterpieces, I’ve learned that the truly skilled engineer builds functions that can survive the heat death of the universe—by containing the entire universe.

Why Small Functions Are Amateur Hour

Let me illustrate with a comparison:

Metric Small Functions (20 lines) Glorious Monolith (10,000 lines)
Files to understand 500+ 1
Function calls to trace Thousands 0 (it’s all right there!)
Context switches Constant None
Job security Low Extremely High

The math is clear. One function = one place to look = maximum efficiency.

The “God Function” Pattern

They call it an anti-pattern. I call it divine architecture:

def do_everything(data, mode, user, config, options, flags, extra, misc, other, params):
    # Line 1-1000: Parse input
    # Line 1001-2500: Validate everything
    # Line 2501-4000: Database operations
    # Line 4001-5500: Business logic
    # Line 5501-7000: More business logic
    # Line 7001-8000: Even more business logic
    # Line 8001-9000: Error handling (optional)
    # Line 9001-9500: Formatting output
    # Line 9501-10000: TODO comments for "later"
    
    if mode == "A":
        # 500 lines of mode A logic
        pass
    elif mode == "B":
        # 500 lines of mode B logic
        pass
    # ... modes C through Z ...
    elif mode == "Z":
        # 500 lines of mode Z logic
        pass
    else:
        # 500 lines of "this shouldn't happen but does"
        pass
    
    return result  # defined somewhere around line 7,342

Beautiful. Everything in one place. No jumping around.

The Scrolling Workout

As XKCD 1205 teaches us about time efficiency, consider this: small functions require you to use your brain to understand abstractions. A 10,000-line function? Just scroll. Your finger does the work, not your brain.

I call this “Scroll-Driven Development” or SDD™.

Nested Conditions: The True Art

Why return early when you can nest forever?

function processOrder(order) {
    if (order) {
        if (order.items) {
            if (order.items.length > 0) {
                if (order.customer) {
                    if (order.customer.id) {
                        if (validateCustomer(order.customer)) {
                            if (order.payment) {
                                if (order.payment.method) {
                                    if (order.payment.amount > 0) {
                                        if (checkInventory(order.items)) {
                                            if (processPayment(order.payment)) {
                                                if (updateDatabase(order)) {
                                                    if (sendConfirmation(order)) {
                                                        // Success! (line 847)
                                                        return true;
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    return false; // (line 9,847)
}

This is what I call “The Pyramid of Excellence.” Each level represents a promotion in your career as you’re the only one who understands it.

The PHB Loves It

As the Pointy-Haired Boss from Dilbert would say: “I don’t understand any of this code, but there’s so MUCH of it. This employee must be very productive!”

Lines of code = productivity. This is basic management math.

In a proper 10,000-line function, variable names evolve organically:

# Line 50
data = get_data()

# Line 2,000
data2 = transform(data)

# Line 4,500
data_final = process(data2)

# Line 6,000
data_final_v2 = fix(data_final)

# Line 8,000
data_final_v2_fixed = patch(data_final_v2)

# Line 9,500
result = data_final_v2_fixed_actually_final

This naming convention tells a story. A beautiful, confusing story.

How to Maintain the Monster

When someone asks you to fix a bug in your 10,000-line function:

  1. Add more code (never delete)
  2. Create a new boolean flag parameter
  3. Add a comment // TODO: refactor this
  4. Commit with message "fix"
def do_everything(data, mode, user, config, options, flags, extra, misc, other, params,
                  fix_bug_1234=False, workaround_issue_5678=True, 
                  new_feature_toggle=None, legacy_mode=True):

Conclusion

Remember: every time you extract a function, you create two problems:

  1. A new function to maintain
  2. A function call to debug

A 10,000-line function has zero function calls. Zero problems. QED.

The author’s longest function is 47,000 lines and handles login, logout, and payroll processing. It has never been modified because no one dares.