# Essential Unison Programming Language Tips for Beginners

Are you a beginner in the world of programming and looking for a language that is easy to learn and use? Look no further than Unison! Unison is a functional programming language that is gaining popularity among developers due to its simplicity and efficiency. In this article, we will provide you with essential Unison programming language tips for beginners.

## What is Unison?

Unison is a functional programming language that is designed to be simple, efficient, and scalable. It is a statically typed language, which means that the type of a variable is determined at compile time. Unison is also a pure functional language, which means that it does not allow side effects or mutable state.

## Tip #1: Learn the Basics of Functional Programming

Before diving into Unison, it is essential to understand the basics of functional programming. Functional programming is a programming paradigm that emphasizes the use of functions to solve problems. In functional programming, functions are treated as first-class citizens, which means that they can be passed as arguments to other functions and returned as values from functions.

To get started with functional programming, you should learn about higher-order functions, lambda expressions, and recursion. These concepts are fundamental to functional programming and will help you understand Unison better.

## Tip #2: Understand Unison's Syntax

Unison's syntax is simple and easy to understand. It uses indentation to indicate blocks of code, similar to Python. Unison also uses a type inference system, which means that you do not have to specify the type of a variable explicitly.

Here is an example of a simple Unison program:

``````main =
let x = 5
let y = 10
let z = x + y
print z
``````

In this program, we define a function called `main` that calculates the sum of two variables `x` and `y` and prints the result.

## Tip #3: Use Unison's Built-in Functions

Unison comes with a set of built-in functions that you can use to perform common operations. These functions include `print`, `add`, `subtract`, `multiply`, and `divide`. You can also define your own functions using the `let` keyword.

Here is an example of a program that uses Unison's built-in functions:

``````main =
let x = add 5 10
let y = subtract 20 5
let z = multiply x y
print z
``````

In this program, we use the `add`, `subtract`, and `multiply` functions to calculate the value of `z`.

## Tip #4: Use Unison's Type System

Unison's type system is designed to catch errors at compile time, which can save you a lot of time and effort in debugging. Unison uses a type inference system, which means that you do not have to specify the type of a variable explicitly.

Here is an example of a program that uses Unison's type system:

``````main =
let x = 5
let y = "hello"
let z = x + y
print z
``````

In this program, we try to add a number and a string, which is not allowed in Unison. The compiler will catch this error at compile time and prevent the program from running.

## Tip #5: Use Unison's Modules

Unison allows you to organize your code into modules, which can help you manage large projects. A module is a collection of related functions and data types that can be imported into other modules.

Here is an example of a program that uses Unison's modules:

``````module Math

let add x y = x + y
let subtract x y = x - y
let multiply x y = x * y
let divide x y = x / y
``````

In this program, we define a module called `Math` that contains four functions for performing basic arithmetic operations. We can then import this module into another program using the `import` keyword:

``````import Math

main =
let x = Math.add 5 10
let y = Math.subtract 20 5
let z = Math.multiply x y
print z
``````

## Tip #6: Use Unison's Interactive Mode

Unison comes with an interactive mode that allows you to test your code and experiment with different functions and data types. To enter interactive mode, simply type `unison` in your terminal.

Here is an example of using Unison's interactive mode:

``````\$ unison
> let x = 5
> let y = 10
> let z = x + y
> print z
15
``````

In this example, we define three variables and calculate their sum using the `+` operator. We then print the result using the `print` function.

## Conclusion

Unison is a simple and efficient programming language that is perfect for beginners. By following these essential Unison programming language tips, you can start writing your own Unison programs and become a proficient Unison developer in no time. Happy coding!

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Written by AI researcher, Haskell Ruska, PhD (haskellr@mit.edu). Scientific Journal of AI 2023, Peer Reviewed