Learn a strong functional programming language like Clojure with a deep understanding of concepts, mindset, and code conventions.

Clojure, a robust functional programming language, employs the principle of pure coding to enhance code encapsulation, reusability, test coverage, and system maintenance. Its succinct grammar further enhances its capabilities.

Throughout this course, you will delve into the core tenets of functional programming. This foundation ensures a comprehensive grasp of the rationale behind Clojure's approach. You will also immerse yourself in Clojure coding, exploring captivating and illuminating subjects that define its unique functional nature. Moreover, you’ll gain insights into the formidable tools that Clojure seamlessly integrates, including Java libraries.

Clojure stands as a premier choice among functional programming languages. It leverages the Java Virtual Machine (JVM), enjoys wide adoption in the tech industry, and boasts a straightforward setup. Its accelerated learning curve has propelled its growth in the market, making it an invaluable asset for learners to acquire.

Becoming a Functional Programmer with Clojure

Which Clojure library is special and often the most useful?


Which Clojure library is special and often the most useful?

```
(let (a 1
       b  “other”)  ; code here )
```

```
(let [a 1
       b  “other”]  ; code here )
```

```
(def a 1 ; code that uses the variables here)

``` 
(def [a 1] ;code that uses the variables here) 

In Clojure, it's not common to have auxiliary variables in a function; however, we can declare some local variables when necessary using a function from the `clojure.core` namespace. Which function is it, and what structure does it have?

In Clojure, it’s not common to have auxiliary variables in a function; however, we can declare some local variables when necessary using a function from the <code>clojure.core</code> namespace. Which function is it, and what structure does it have?

There are many types of conditionals, such as:

1. An `if`/`else` that can store the variable being evaluated. 

2. A conditional that only evaluates a predicate and only acts when that's true without needing an `else`. 

3. A conditional that checks many predicates and follows different flows for each one. 

Please identify each of these in the same order.





There are many types of conditionals, such as:
<ol>
<li>
An <code>if</code>/<code>else</code> that can store the variable being evaluated.
</li>
<li>
A conditional that only evaluates a predicate and only acts when that’s true without needing an <code>else</code>.
</li>
<li>
A conditional that checks many predicates and follows different flows for each one.
</li>
</ol>
Please identify each of these in the same order.

Imagine that you need to evaluate many possibilities that wouldn't fit in an `if`/`else` statement, and you need to branch to many different flows. These conditions might be anything—they don't need to be related. Which Clojure function would you use?

Imagine that you need to evaluate many possibilities that wouldn’t fit in an <code>if</code>/<code>else</code> statement, and you need to branch to many different flows. These conditions might be anything—they don’t need to be related. Which Clojure function would you use?

You want to branch to multiple flows; however, the conditional expression you use can yield various values. You're considering that this specific expression might have $N$ different values, and you're going to branch based on that. What is this expression? 

You want to branch to multiple flows; however, the conditional expression you use can yield various values. You’re considering that this specific expression might have <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>N</mi></mrow><annotation encoding="application/x-tex">N</annotation></semantics></math>N different values, and you’re going to branch based on that. What is this expression?

What's the purpose of laziness or lazy evaluation?

What’s the purpose of laziness or lazy evaluation?

Lazy evaluation is widely used in Clojure, and we can use it in unison with many fundamental functions. There are two strategies to realize lazy elements: one by one or in chunks. When we want to use realization in chunks, which involves handling elements in groups, there are two main functions that we can use: one that gets the first $N$ elements and one that removes the first $N$ elements, with a `range` function or a collection. What are these functions?

Lazy evaluation is widely used in Clojure, and we can use it in unison with many fundamental functions. There are two strategies to realize lazy elements: one by one or in chunks. When we want to use realization in chunks, which involves handling elements in groups, there are two main functions that we can use: one that gets the first <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>N</mi></mrow><annotation encoding="application/x-tex">N</annotation></semantics></math>N elements and one that removes the first <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>N</mi></mrow><annotation encoding="application/x-tex">N</annotation></semantics></math>N elements, with a <code>range</code> function or a collection. What are these functions?

Collections are the most used data structures that Clojure has, and there are three main functions to help perform transformations over collections. Which functions are they?

Collections are the most used data structures that Clojure has, and there are three main functions to help perform transformations over collections. Which functions are they?

``` 
{variable-a :a
 variable-b :b
 variable-c :c}
```

```
{variable-a :a
 variable-b :b
 {variable-a-c :a} :c}
```

```
{:keys [a b c]
{variable-a-c :a} :c}
```

Consider this data structure: `{:a 1 :b 2 :c {:a 10}}`

How can you isolate the keys `:a` and `:b` and the internal `:a` that's inside `:c` using destructure?

Note that we only want `a`, `b`, and the other `a`. And they can be associated with any variable name.





Consider this data structure: <code>{:a 1 :b 2 :c {:a 10}}</code>
How can you isolate the keys <code>:a</code> and <code>:b</code> and the internal <code>:a</code> that’s inside <code>:c</code> using destructure?
Note that we only want <code>a</code>, <code>b</code>, and the other <code>a</code>. And they can be associated with any variable name.

```
(defn function-name
      [] ;code
      [a] ;code) 
```

```
(defn function-name
      ([] ;code)
      ([a] ;code)) 
```

```
(defn function-name
      [] {;code}
      [a] {;code}) 
```

```
(defn function-name
      {[] ;code}
      {[a] ;code}) 
```

What's the structure of multi-arity functions?

What’s the structure of multi-arity functions?

Functions with more than one possibility of arity

Let's recap all the content about functions with a comprehensive quiz.

Introduction

Functional Programming (FP)

A Short History of Clojure

Data Structures

Functions

Multimethods, Protocols, Records, and Namespaces

Clojure and Its Macros

Concurrency and Parallelism Support

Clojure Unit Testing

Java Interop

Writing a Clean Clojure Code

Bank Account Activities

Conclusion

Quiz: Functions