COMPLEX IS EASY -...

COMPLEX IS EASY, IT’S SIMPLE WHICH IS HARD

@sarahtarap

SARAH TARAPOREWALLA

TECH PRINCIPAL @sarahtarap

3

Let’s Explore

1 Complexity in the Real World

2 How does it happen?

3 The One About The Checkbox

4 The One About The Fortress

5 The One About The Article

6 The One about the Pricing Rules

@sarahtarap

@sarahtarap

Complexity in the Real World

@sarahtarap

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CYNEFIN FRAMEWORK

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@sarahtarap

How does it happen?

@sarahtarap

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@sarahtarap

2 6 81 3 4

@sarahtarap

2 6 81 3 42 5 7

@sarahtarap

2 6 81 3 42 5 75 8 11

@sarahtarap

2 6 81 3 42 5 75 8 11

x < y < z

@sarahtarap

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The One About The Checkbox

@sarahtarap

SIMPLE CODE MANIFESTO

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Composition Matchers

Tiny Types SRP

Decorators

Inheritance If-Then-Else Primitives Fat Objects Mixed Concerns

over over over over over

@sarahtarap starapor

@sarahtarap

BOY SCOUT RULE

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@sarahtarap

RED GREEN

REFACTOR

REFACTOR

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@sarahtarap

RED GREEN

REFACTOR

REFACTOR

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REFACTOR REVERT

REFACTOR COMMIT

@sarahtarap

Trailing commas in lists _matcher = new Matcher<Player> { { p => p.InPenaltyBox(), ReducePenaltyTime }, { p => p.WearingAHat(), RemoveTheHat }, { p => true, PlayARound }, };Brackets { } around conditionals

public void TakeTurn(Player player) { if (player.InPenaltyBox()) { ReducePenaltyTime(); }}

GOOD CITIZEN

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@sarahtarap

INTENTION REVEALING INTERFACES

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IFooHandler => IHandleLotsOfFoos IGameRepository => ICanFindTheGame

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SIDE-EFFECT FREE CODE

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SQUINT TEST

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@sarahtarap

SSimple Code

Manifesto

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The One About The Fortress

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JOB SECURITY

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@sarahtarap

OPENNESS & COLLABORATION

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@sarahtarap

OOpenness

and Collaboration

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The One About The Article

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DOMAIN DRIVEN DESIGN

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UBIQUITOUS LANGUAGE

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BOUNDED CONTEXTS

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@sarahtarap

DOMAIN DRIVEN DESIGN

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@sarahtarap

DOMAIN DRIVEN DESIGN

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UUbiquitous Language &

DDD

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The One About The Legacy

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EXPLAIN YOUR SYSTEM

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@sarahtarap

SIMON BROWN’S C4 MODEL

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DESIGN-ON-A-POST-IT

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@sarahtarap

PPost-it Design

@sarahtarap

The One About The Pricing Rules

@sarahtarap

GENERALISE

SPECIALISE

@sarahtarap

SSpecialise to Generalise

@sarahtarap

To Recap

@sarahtarap

SSimple Code

Manifesto

OOpenness

and Collaboration

UUbiquitous Language &

DDD

PPost-it Design

SSpecialise to Generalise

@sarahtarap

SARAH TARAPOREWALLA

@sarahtarap

SSimple Code

Manifesto

OOpenness

and Collaboration

UUbiquitous Language &

DDD

PPost-it Design

SSpecialise to Generalise

@sarahtarap

Q&A

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