Welcome to Read: 09
Refactoring
In this Read: 09, I will talk about this topic:
- FUNCTIONAL PROGRAMMING.
FUNCTIONAL PROGRAMMING
Functional programming is a programming paradigm — a style of building the structure and elements of computer programs — that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data
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Pure functions
- The first fundamental concept we learn when we want to understand functional programming is pure functions. But what does that really mean? What makes a function pure?
So how do we know if a function is pure or not? Here is a very strict definition of purity:
It returns the same result if given the same arguments (it is also referred as deterministic).
It does not cause any observable side effects.
It returns the same result if given the same arguments.
- Reading Files
If our function reads external files, it’s not a pure function — the file’s contents can change. - Random number generation
Any function that relies on a random number generator cannot be pure.
- Reading Files
- The first fundamental concept we learn when we want to understand functional programming is pure functions. But what does that really mean? What makes a function pure?
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Immutability
- When data is immutable, its state cannot change after it’s created. If you want to change an immutable object, you can’t. Instead, you create a new object with the new value.
- When data is immutable, its state cannot change after it’s created. If you want to change an immutable object, you can’t. Instead, you create a new object with the new value.
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Referential transparency
- Basically, if a function consistently yields the same result for the same input, it is referentially transparent.
pure functions + immutable data = referential transparency</span>
- Basically, if a function consistently yields the same result for the same input, it is referentially transparent.
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| Read | Title | ToGo |
|---|---|---|
| Read: 01 | SMACSS and Responsive Web Design |  |
| Read: 02 | jQuery, Events, and The DOM | |
| Read: 03 | Flexbox and Templating | |
| Read: 04 | Responsive Web Design and Regular Expressions | |
| Read: 05 | Heroku Deployment | |
| Read: 06 | Node, Express, and APIs | |
| Read: 07 | APIs continued | |
| Read: 08 | SQL | |
| Read: 09 | Refactoring | |
| Read: 10 | The Call Stack and Debugging | |
| Read: 11 | EJS | |
| Read: 12 | Components | |
| Read: 13 | Update/Delete | |
| Read: 14a | DB Normalization | |
| Read: 15 | Diversity and Inclusion | |