Becoming Certified - MageTitansMCR 2018

BECOMING
CERTIFIEDBecoming Certified - (c) @VinaiKopp - #MageTitansMCR - 2018-11-10

Who here has sat in
one or more Magento 1 exams?
Becoming Certified - (c) @VinaiKopp - #MageTitansMCR - 2018-11-10

Who here has sat in
one or more Magento 2 exams?

SO LET'S NOT TAKE
THIS TOO SERIOUSLY

Magento 1 Certificaton
!=
Magento 2 Certification

How so?

Magento 1 &
Magento 2:
Questions are developed by a
Community Advisory Board

Magento 1 &
Magento 2:
Each question is written to fit an
Exam Blueprint Objective

Magento 1 != Magento 2:
Time frame and
Review Process

Magento 1:
Months of online meetings and reviews
Magento 2:
One week focus group, all in one room

Magento 1:
Rather contrived, memorization friendly
Magento 2:
Scenario based, real life, more natural

Magento 1:
Questions about Config XML Paths and Class Names.

The Reasoning was:
"Magento Developers with experience will have written
them countless times and know them by heart."

This was before Magicento existed...

Magicento:
▸ Code generation
▸ Autocompletion

Magento 2:
No questions about things
with IDE autocompletion

How do the questions look like?

Each item has 3 Parts:
▸ The Scenario
▸ The Stem
▸ The Options

▸ The Scenario
Information required to choose the correct answer

▸ The Stem
The question

▸ The Options
The possible answers

Valid answer keys:
▸ Choose 1 out of 4

If more than one answer has to be selected,
the number of required options is stated like this:
"Which three actions do you take? (Choose three)"

For questions with multiple answers,
the right number of options have to be selected and
all selected answers have to be correct.

▸ No trick questions
▸ No “none of the above”
▸ No “all of the above”
▸ No “which of the following are true”
▸ No double negatives

ACTIONABLE
QUESTIONS!

"How do you fix the issue?"
"What actions do you take?"
"What is the effect of that code?"

EXAMPLE
QUESTIONBecoming Certified - (c) @VinaiKopp - #MageTitansMCR - 2018-11-10

(1/2)
You are working for an extensions vendor who protects their
intellectual property by validating licenses against a license server.
Customers are complaining that running any bin/magento command is
very slow after installing one of the companies extensions.
The extension adds a command to bin/magento.
While investigating, you discover the following code in the
command class:
public function __construct($license)
{
$this->isLicenseValid = $this->validateLicense($license);
parent::__construct();
}

(2/2)
public function __construct($license)
{
$this->isLicenseValid = $this->validateLicense($license);
parent::__construct();
}
How do you resolve the issue?
A. Implement local license validation instead of over the internet
B. Move the validateLicense() call into the execute() method
C. Check the license at random samples instead of every time
D. Cache the validation result in the Magento config cache

Answer:
B. Move the validateLicense() call into the execute() method

Magento Technical Guidelines
2.3. Class constructor can have only dependency
assignment operations and/or argument validation
operations. No other operations are allowed.

Example Excerpt:

But why?

Why?

(back to the topic of exam questions)

SOME QUESTIONS HAVE QUALIFIERS.
What are qualifiers?

Qualifiers are part of the Stem:
▸ Keeping simplicity in mind ...
▸ Keeping maintainability in mind ...
▸ Keeping compatibility in mind ...
▸ Keeping testability in mind ...

WHAT IS THE PURPOSE OF QUALIFIERS?
They guide us to the correct answer.

Magento is flexible.
There are many ways to accomplish a goal.

We often have to make decisions
how to implement a requirement.

For questions with qualifiers
often more than one answer is technically correct.

Do we use ...
a preference,
a type argument configuration
or a plugin?

Do we use ...
an ORM model
or a Api Data model?

Do we inject ...
an interface
or a concrete implementation?

Depending on the circumstances,
every approach could be valid.

Faster development vs. better maintainability
More upgradable code vs. more performant code
...

▸ lifetime of the project
▸ project budget
▸ developer skill level
▸ security considerations (internal / external access)
▸ use of third party modules
▸ desired code reuse

Qualifiers tell us which answer to choose
for the given scenario.

Maintainability?
Probably rules out options where code is copied.
Favor answers that make changes and upgrades simpler.

Compatibility?
Rule out options with a higher
extension conflict probability.

Simplicity?
Favor expressive options using the
least number of elements.

Testability or Reusability?
Favor answers that allow replacing collaborators
with test doubles or other classes.

You need to customize the Magento_Checkout/js/proceed-to-checkout
JavaScript module.
How do you do that, keeping compatibility in mind?
A. Add a path override configuration to the requirejs-config.js
B. Add a global map alias override to the requirejs-config.js
C. Copy the file proceed-to-checkout.js to the folder
Magento_Checkout/js/ of the active frontend theme
D. Add a JavaScript mixin to the requirejs-config.js

Answer:
D. Add a JavaScript mixin to the requirejs-config.js

GETTING
READY

Study Guide
The study guide is based on the exam blueprint.

SWIFT OTTER STUDY GUIDES
Based on the Magento U study guide
but much expanded.

The Official Technical Developer Guidelines
(ask Why?)

Don't memorize OOP patterns and principles for the exam.
Without experience, that does more harm than good.

Better to go from first principles:
▸ What is a source code dependency?
▸ What are the consequences of a dependency?

Deeper understanding
of the principles behind the labels.

▸ Interfaces and the Liskov Substitution principle
▸ Coupling and Cohesion
▸ Favor Composition over Inheritance

Familiarize yourself with
Kent Beck’s 4 rules of simple design.

1. Passes all tests
2. Expresses intent 3. No duplication
4. Fewest possible elements

When a question has the qualifier
“Keeping simplicity in mind...”
apply these rules.

SMART
GUESSING

And finally...

Becoming Certified - MageTitansMCR 2018

Becoming Certified - MageTitansMCR 2018

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