Notes

there are three main categories of Design Patterns as decreed by the ‘Gang of Four’¹ (the authors of a seminal work Design Patterns | Elements of Reusable Object-Oriented Software). the content here is largely based on Dive into Design Patterns by Alexander Shvets².

dry#

don’t repeat yourself.

overview#

the Unified Modelling Language (UML) is a standardised visual language for specifying, constructing, and documenting software systems.

git checkout#

is deprecated.

git checkout --<file> will discard working tree changes.

recall that your working-tree is working-directory. similarly there is a staging area and a place to commit things.

finally, there is also the upstream repository that contains a copy of the code should shit go to fuck.

que

<figure><img src="https://ox-hugo.scripter.co/test/images/org-mode-unicorn-logo.png">
</figure>

He puts his claw against the divider. “Fist my bump.”

Andy Weir, Project Hail Mary

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setting the stage#

1. Mental Focus
2. Learn a programming language
3. Learn Data structures and algorithms
4. Complete Leetcode / programming practice
5. Software Engineering Concepts
6. Behavioural Practice
7. Best Methods of Applying
8. Interview Process & Internal Guidelines.

process for problem solving#

• always read the problem statement twice.
  • ask clarifying questions
• try think of different ways to solve the problem
• think end-to-end of the best solutions based on complexity
• write the algorithm from patterns in drawing
• code it out
• try and improve it once you think you’re finished.
• go through other solutions (even if you answered correctly)

problems#

arrays#

217. duplicate values | easy#

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.