Table of Contents

1. About
2. Feature Showcase
3. Libraries
4. Todo

About

Pola is an interpreted object-oriented programming language written in Kotlin created for learning purposes. Examples can be found in the examples directory.

Feature Showcase

Note: Examples marked with a "*" assume that some libraries have been imported.

Comments

# This is a comment

Imports

import("io") # An instance of the class IO
import("array") # A reference to the class Arrays
val println = io.println # A reference to the function io.println

Math

var x = 10
x = x + 10 # 20
x = x - 10 # 10
x = x / 2 # 5
x = x * 2 # 10
x = x % 2 # 0
x = ++x # 1
x = --x # 0

Variables

var mutable = "This is mutable."
val immutable = "This is immutable."

Primitives

val num = 0
val bool = true

Objects *

val str = "string"
val arr = array(0, 1)

Control Flow

if(true) {
}
while(true) {
}
for(i = 0; i < 10; i = ++i) {
}

First-Class Functions *

# Num -> Boolean
fun isEven(value) {
 return value % 2 == 0
}
val num = 5
val isNumEven = isEven(x) # false
val numArray = array(1, 2, 3, 4)
val evenNumArray = numArray.filter(isEven) # [2.0, 4.0]

Anonymous Functions *

val x = array(0, 1, 2, 3) # [0.0, 1.0, 2.0, 3.0]
val xPlusOne = x.map(fun (value) {
 return ++value
}) # [1.0, 2.0, 3.0, 4.0]

Classes *

class Product {
 # (String, String, Num) -> Product
 init(name, brand, price) {
 this.name = name
 this.brand = brand
 this.price = price
 }
 
 # () -> String
 toString() {
 return "The " + this.name + " from " + this.brand + " costs $" + this.price + "."
 }
}
class MottsAppleSauce inherits Product {
 # () -> MottsAppleSauce
 init() {
 super.init("Applesauce", "Mott's", 7)
 }
}
val applesauce = MottsAppleSauce() # Instance of MottsAppleSauce
val coke = Product("Coke", "Coca Cola", 2) # Instance of Product

Libraries

IO

Sys

Array

String

File

Errors

Todo

• Create a Javadoc
• Improve README documentation
• Remove primitives